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Simplifying (20 + -2x) + (5x + 23.5) = 90 Remove parenthesis around (20 + -2x) 20 + -2x + (5x + 23.5) = 90 Reorder the terms: 20 + -2x + (23.5 + 5x) = 90 Remove parenthesis around (23.5 + 5x) 20 + -2x + 23.5 + 5x = 90 Reorder the terms: 20 + 23.5 + -2x + 5x = 90 Combine like terms: 20 + 23.5 = 43.5 43.5 + -2x + 5x = 90 Combine like terms: -2x + 5x = 3x 43.5 + 3x = 90 Solving 43.5 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-43.5' to each side of the equation. 43.5 + -43.5 + 3x = 90 + -43.5 Combine like terms: 43.5 + -43.5 = 0.0 0.0 + 3x = 90 + -43.5 3x = 90 + -43.5 Combine like terms: 90 + -43.5 = 46.5 3x = 46.5 Divide each side by '3'. x = 15.5 Simplifying x = 15.5
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