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Simplifying (2x + 15) + x = 90 Reorder the terms: (15 + 2x) + x = 90 Remove parenthesis around (15 + 2x) 15 + 2x + x = 90 Combine like terms: 2x + x = 3x 15 + 3x = 90 Solving 15 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 3x = 90 + -15 Combine like terms: 15 + -15 = 0 0 + 3x = 90 + -15 3x = 90 + -15 Combine like terms: 90 + -15 = 75 3x = 75 Divide each side by '3'. x = 25 Simplifying x = 25
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