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Simplifying -9 = -3(n + -15) Reorder the terms: -9 = -3(-15 + n) -9 = (-15 * -3 + n * -3) -9 = (45 + -3n) Solving -9 = 45 + -3n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3n' to each side of the equation. -9 + 3n = 45 + -3n + 3n Combine like terms: -3n + 3n = 0 -9 + 3n = 45 + 0 -9 + 3n = 45 Add '9' to each side of the equation. -9 + 9 + 3n = 45 + 9 Combine like terms: -9 + 9 = 0 0 + 3n = 45 + 9 3n = 45 + 9 Combine like terms: 45 + 9 = 54 3n = 54 Divide each side by '3'. n = 18 Simplifying n = 18
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