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Simplifying (x + -20) + (2x + 20) = 90 Reorder the terms: (-20 + x) + (2x + 20) = 90 Remove parenthesis around (-20 + x) -20 + x + (2x + 20) = 90 Reorder the terms: -20 + x + (20 + 2x) = 90 Remove parenthesis around (20 + 2x) -20 + x + 20 + 2x = 90 Reorder the terms: -20 + 20 + x + 2x = 90 Combine like terms: -20 + 20 = 0 0 + x + 2x = 90 x + 2x = 90 Combine like terms: x + 2x = 3x 3x = 90 Solving 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '3'. x = 30 Simplifying x = 30
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