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Simplifying 138 = -3(5n + -6) Reorder the terms: 138 = -3(-6 + 5n) 138 = (-6 * -3 + 5n * -3) 138 = (18 + -15n) Solving 138 = 18 + -15n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '15n' to each side of the equation. 138 + 15n = 18 + -15n + 15n Combine like terms: -15n + 15n = 0 138 + 15n = 18 + 0 138 + 15n = 18 Add '-138' to each side of the equation. 138 + -138 + 15n = 18 + -138 Combine like terms: 138 + -138 = 0 0 + 15n = 18 + -138 15n = 18 + -138 Combine like terms: 18 + -138 = -120 15n = -120 Divide each side by '15'. n = -8 Simplifying n = -8
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