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Simplifying 15x + -1(2x + -9) = 87 Reorder the terms: 15x + -1(-9 + 2x) = 87 15x + (-9 * -1 + 2x * -1) = 87 15x + (9 + -2x) = 87 Reorder the terms: 9 + 15x + -2x = 87 Combine like terms: 15x + -2x = 13x 9 + 13x = 87 Solving 9 + 13x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 13x = 87 + -9 Combine like terms: 9 + -9 = 0 0 + 13x = 87 + -9 13x = 87 + -9 Combine like terms: 87 + -9 = 78 13x = 78 Divide each side by '13'. x = 6 Simplifying x = 6
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