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Simplifying (x + -12) + (2x + 15) = 90 Reorder the terms: (-12 + x) + (2x + 15) = 90 Remove parenthesis around (-12 + x) -12 + x + (2x + 15) = 90 Reorder the terms: -12 + x + (15 + 2x) = 90 Remove parenthesis around (15 + 2x) -12 + x + 15 + 2x = 90 Reorder the terms: -12 + 15 + x + 2x = 90 Combine like terms: -12 + 15 = 3 3 + x + 2x = 90 Combine like terms: x + 2x = 3x 3 + 3x = 90 Solving 3 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3x = 90 + -3 Combine like terms: 3 + -3 = 0 0 + 3x = 90 + -3 3x = 90 + -3 Combine like terms: 90 + -3 = 87 3x = 87 Divide each side by '3'. x = 29 Simplifying x = 29
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