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Simplifying (x + 20) + (x + -20) = 90 Reorder the terms: (20 + x) + (x + -20) = 90 Remove parenthesis around (20 + x) 20 + x + (x + -20) = 90 Reorder the terms: 20 + x + (-20 + x) = 90 Remove parenthesis around (-20 + x) 20 + x + -20 + x = 90 Reorder the terms: 20 + -20 + x + x = 90 Combine like terms: 20 + -20 = 0 0 + x + x = 90 x + x = 90 Combine like terms: x + x = 2x 2x = 90 Solving 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '2'. x = 45 Simplifying x = 45
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