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Simplifying 13x + -1(3x + -7) = 87 Reorder the terms: 13x + -1(-7 + 3x) = 87 13x + (-7 * -1 + 3x * -1) = 87 13x + (7 + -3x) = 87 Reorder the terms: 7 + 13x + -3x = 87 Combine like terms: 13x + -3x = 10x 7 + 10x = 87 Solving 7 + 10x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 10x = 87 + -7 Combine like terms: 7 + -7 = 0 0 + 10x = 87 + -7 10x = 87 + -7 Combine like terms: 87 + -7 = 80 10x = 80 Divide each side by '10'. x = 8 Simplifying x = 8
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