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Solve the equation for all values of 
x.

|4x+9|=5x
Answer: 
x=

Solve the equation for all values of x x .\newline4x+9=5x |4 x+9|=5 x \newlineAnswer: x= x=

Full solution

Q. Solve the equation for all values of x x .\newline4x+9=5x |4 x+9|=5 x \newlineAnswer: x= x=
  1. Consider Two Cases: We have the equation 4x+9=5x|4x + 9| = 5x. To solve this, we need to consider two cases because the absolute value function outputs the same value for both the positive and negative versions of its input.
  2. Case 11: Non-Negative Expression: Case 11: The expression inside the absolute value is non-negative. This means we can remove the absolute value without changing the sign.\newlineSo, we have 4x+9=5x4x + 9 = 5x.\newlineNow, we solve for xx.\newlineSubtract 4x4x from both sides to get 9=x9 = x.
  3. Case 22: Negative Expression: Case 22: The expression inside the absolute value is negative. This means we need to take the negative of the inside expression when removing the absolute value.\newlineSo, we have (4x+9)=5x- (4x + 9) = 5x.\newlineNow, we solve for xx.\newlineDistribute the negative sign to get 4x9=5x-4x - 9 = 5x.\newlineAdd 4x4x to both sides to get 9=9x-9 = 9x.\newlineDivide both sides by 99 to get 1=x-1 = x.
  4. Find Potential Solutions: We have found two potential solutions for xx: x=9x = 9 from Case 11 and x=1x = -1 from Case 22. However, we must check these solutions to ensure they satisfy the original equation.
  5. Check x=9x = 9: Check x=9x = 9 in the original equation 4x+9=5x|4x + 9| = 5x.\newlineSubstitute xx with 99 to get 4(9)+9=5(9)|4(9) + 9| = 5(9).\newlineCalculate the left side: 36+9=45=45|36 + 9| = |45| = 45.\newlineCalculate the right side: 5(9)=455(9) = 45.\newlineSince both sides are equal, x=9x = 9 is a solution.
  6. Check x=1x = -1: Check x=1x = -1 in the original equation 4x+9=5x|4x + 9| = 5x. Substitute xx with 1-1 to get 4(1)+9=5(1)|4(-1) + 9| = 5(-1). Calculate the left side: 4+9=5=5|-4 + 9| = |5| = 5. Calculate the right side: 5(1)=55(-1) = -5. Since both sides are not equal, x=1x = -1 is not a solution.

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