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Simplifying 87 = 3(5 + -6n) 87 = (5 * 3 + -6n * 3) 87 = (15 + -18n) Solving 87 = 15 + -18n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '18n' to each side of the equation. 87 + 18n = 15 + -18n + 18n Combine like terms: -18n + 18n = 0 87 + 18n = 15 + 0 87 + 18n = 15 Add '-87' to each side of the equation. 87 + -87 + 18n = 15 + -87 Combine like terms: 87 + -87 = 0 0 + 18n = 15 + -87 18n = 15 + -87 Combine like terms: 15 + -87 = -72 18n = -72 Divide each side by '18'. n = -4 Simplifying n = -4
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