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Simplifying (9x + -12) + (9x + -3) = 129 Reorder the terms: (-12 + 9x) + (9x + -3) = 129 Remove parenthesis around (-12 + 9x) -12 + 9x + (9x + -3) = 129 Reorder the terms: -12 + 9x + (-3 + 9x) = 129 Remove parenthesis around (-3 + 9x) -12 + 9x + -3 + 9x = 129 Reorder the terms: -12 + -3 + 9x + 9x = 129 Combine like terms: -12 + -3 = -15 -15 + 9x + 9x = 129 Combine like terms: 9x + 9x = 18x -15 + 18x = 129 Solving -15 + 18x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 18x = 129 + 15 Combine like terms: -15 + 15 = 0 0 + 18x = 129 + 15 18x = 129 + 15 Combine like terms: 129 + 15 = 144 18x = 144 Divide each side by '18'. x = 8 Simplifying x = 8
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