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If x-21=6, what is the value of x ?

If x−21=6 x-21=6 , what is the value of x x ?

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Full solution

Q. If x−21=6 x-21=6 , what is the value of x x ?
  1. Add 2121 to both sides: To solve for xx, we need to isolate xx on one side of the equation. We can do this by adding 2121 to both sides of the equation to cancel out the −21-21 on the left side.\newlinex−21+21=6+21x - 21 + 21 = 6 + 21
  2. Perform addition: Perform the addition on both sides of the equation.\newlinex=6+21x = 6 + 21\newlinex=27x = 27
  3. Check solution: Check the solution by substituting xx back into the original equation to ensure that the left side equals the right side.27−21=627 - 21 = 66=66 = 6This is true, so there is no math error.

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