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Simplifying (x + -20) + x = 90 Reorder the terms: (-20 + x) + x = 90 Remove parenthesis around (-20 + x) -20 + x + x = 90 Combine like terms: x + x = 2x -20 + 2x = 90 Solving -20 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 2x = 90 + 20 Combine like terms: -20 + 20 = 0 0 + 2x = 90 + 20 2x = 90 + 20 Combine like terms: 90 + 20 = 110 2x = 110 Divide each side by '2'. x = 55 Simplifying x = 55
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