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Simplifying (2x + 1) + (x + -1) = 90 Reorder the terms: (1 + 2x) + (x + -1) = 90 Remove parenthesis around (1 + 2x) 1 + 2x + (x + -1) = 90 Reorder the terms: 1 + 2x + (-1 + x) = 90 Remove parenthesis around (-1 + x) 1 + 2x + -1 + x = 90 Reorder the terms: 1 + -1 + 2x + x = 90 Combine like terms: 1 + -1 = 0 0 + 2x + x = 90 2x + x = 90 Combine like terms: 2x + x = 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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