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Simplifying 121 = -3(7 + -7n) + -5 121 = (7 * -3 + -7n * -3) + -5 121 = (-21 + 21n) + -5 Reorder the terms: 121 = -21 + -5 + 21n Combine like terms: -21 + -5 = -26 121 = -26 + 21n Solving 121 = -26 + 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. 121 + -21n = -26 + 21n + -21n Combine like terms: 21n + -21n = 0 121 + -21n = -26 + 0 121 + -21n = -26 Add '-121' to each side of the equation. 121 + -121 + -21n = -26 + -121 Combine like terms: 121 + -121 = 0 0 + -21n = -26 + -121 -21n = -26 + -121 Combine like terms: -26 + -121 = -147 -21n = -147 Divide each side by '-21'. n = 7 Simplifying n = 7
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