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Simplifying 2x + (x + -12) = 90 Reorder the terms: 2x + (-12 + x) = 90 Remove parenthesis around (-12 + x) 2x + -12 + x = 90 Reorder the terms: -12 + 2x + x = 90 Combine like terms: 2x + x = 3x -12 + 3x = 90 Solving -12 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 3x = 90 + 12 Combine like terms: -12 + 12 = 0 0 + 3x = 90 + 12 3x = 90 + 12 Combine like terms: 90 + 12 = 102 3x = 102 Divide each side by '3'. x = 34 Simplifying x = 34
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