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Simplifying -120 = -3(5 + -7n) -120 = (5 * -3 + -7n * -3) -120 = (-15 + 21n) Solving -120 = -15 + 21n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21n' to each side of the equation. -120 + -21n = -15 + 21n + -21n Combine like terms: 21n + -21n = 0 -120 + -21n = -15 + 0 -120 + -21n = -15 Add '120' to each side of the equation. -120 + 120 + -21n = -15 + 120 Combine like terms: -120 + 120 = 0 0 + -21n = -15 + 120 -21n = -15 + 120 Combine like terms: -15 + 120 = 105 -21n = 105 Divide each side by '-21'. n = -5 Simplifying n = -5
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