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Simplifying 90 + (3x + -1) + 31 = 180 Reorder the terms: 90 + (-1 + 3x) + 31 = 180 Remove parenthesis around (-1 + 3x) 90 + -1 + 3x + 31 = 180 Reorder the terms: 90 + -1 + 31 + 3x = 180 Combine like terms: 90 + -1 = 89 89 + 31 + 3x = 180 Combine like terms: 89 + 31 = 120 120 + 3x = 180 Solving 120 + 3x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-120' to each side of the equation. 120 + -120 + 3x = 180 + -120 Combine like terms: 120 + -120 = 0 0 + 3x = 180 + -120 3x = 180 + -120 Combine like terms: 180 + -120 = 60 3x = 60 Divide each side by '3'. x = 20 Simplifying x = 20
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