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Simplifying (4x + -15) + (5x + 15) = 180 Reorder the terms: (-15 + 4x) + (5x + 15) = 180 Remove parenthesis around (-15 + 4x) -15 + 4x + (5x + 15) = 180 Reorder the terms: -15 + 4x + (15 + 5x) = 180 Remove parenthesis around (15 + 5x) -15 + 4x + 15 + 5x = 180 Reorder the terms: -15 + 15 + 4x + 5x = 180 Combine like terms: -15 + 15 = 0 0 + 4x + 5x = 180 4x + 5x = 180 Combine like terms: 4x + 5x = 9x 9x = 180 Solving 9x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '9'. x = 20 Simplifying x = 20
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