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Simplifying 2x + -1(5x + -15) = 123 Reorder the terms: 2x + -1(-15 + 5x) = 123 2x + (-15 * -1 + 5x * -1) = 123 2x + (15 + -5x) = 123 Reorder the terms: 15 + 2x + -5x = 123 Combine like terms: 2x + -5x = -3x 15 + -3x = 123 Solving 15 + -3x = 123 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 = 123 + -15 Combine like terms: 15 + -15 = 0 0 + -3x = 123 + -15 -3x = 123 + -15 Combine like terms: 123 + -15 = 108 -3x = 108 Divide each side by '-3'. x = -36 Simplifying x = -36
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