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Simplifying (45 + -2x) + 75 = 90 Remove parenthesis around (45 + -2x) 45 + -2x + 75 = 90 Reorder the terms: 45 + 75 + -2x = 90 Combine like terms: 45 + 75 = 120 120 + -2x = 90 Solving 120 + -2x = 90 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 + -2x = 90 + -120 Combine like terms: 120 + -120 = 0 0 + -2x = 90 + -120 -2x = 90 + -120 Combine like terms: 90 + -120 = -30 -2x = -30 Divide each side by '-2'. x = 15 Simplifying x = 15
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