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Simplifying (x + 3) + (2x + -3) = 90 Reorder the terms: (3 + x) + (2x + -3) = 90 Remove parenthesis around (3 + x) 3 + x + (2x + -3) = 90 Reorder the terms: 3 + x + (-3 + 2x) = 90 Remove parenthesis around (-3 + 2x) 3 + x + -3 + 2x = 90 Reorder the terms: 3 + -3 + x + 2x = 90 Combine like terms: 3 + -3 = 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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