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Simplifying 87 = -3(5k + -9) Reorder the terms: 87 = -3(-9 + 5k) 87 = (-9 * -3 + 5k * -3) 87 = (27 + -15k) Solving 87 = 27 + -15k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '15k' to each side of the equation. 87 + 15k = 27 + -15k + 15k Combine like terms: -15k + 15k = 0 87 + 15k = 27 + 0 87 + 15k = 27 Add '-87' to each side of the equation. 87 + -87 + 15k = 27 + -87 Combine like terms: 87 + -87 = 0 0 + 15k = 27 + -87 15k = 27 + -87 Combine like terms: 27 + -87 = -60 15k = -60 Divide each side by '15'. k = -4 Simplifying k = -4
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