Distribute Terms: Distribute the 3 across the terms inside the parentheses.We need to multiply 3 by each term inside the parentheses (3x and −4).Calculation: 3×3x=9x and 3×−4=−12So, the equation becomes 9x−12=42.
Add 12: Add 12 to both sides of the equation to isolate the term with the variable x. We want to get x by itself on one side of the equation, so we need to get rid of the −12. Calculation: 9x−12+12=42+12 This simplifies to 9x=54.
Divide by 9: Divide both sides of the equation by 9 to solve for x. Now that we have 9x, we need to divide by 9 to find the value of x. Calculation: 99x=954 This simplifies to x=6.
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