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Simplifying (3x + 6) + (9x + -8) = 142 Reorder the terms: (6 + 3x) + (9x + -8) = 142 Remove parenthesis around (6 + 3x) 6 + 3x + (9x + -8) = 142 Reorder the terms: 6 + 3x + (-8 + 9x) = 142 Remove parenthesis around (-8 + 9x) 6 + 3x + -8 + 9x = 142 Reorder the terms: 6 + -8 + 3x + 9x = 142 Combine like terms: 6 + -8 = -2 -2 + 3x + 9x = 142 Combine like terms: 3x + 9x = 12x -2 + 12x = 142 Solving -2 + 12x = 142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 12x = 142 + 2 Combine like terms: -2 + 2 = 0 0 + 12x = 142 + 2 12x = 142 + 2 Combine like terms: 142 + 2 = 144 12x = 144 Divide each side by '12'. x = 12 Simplifying x = 12
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