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