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Simplifying 91 = 7(1 + -3n) 91 = (1 * 7 + -3n * 7) 91 = (7 + -21n) Solving 91 = 7 + -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. 91 + 21n = 7 + -21n + 21n Combine like terms: -21n + 21n = 0 91 + 21n = 7 + 0 91 + 21n = 7 Add '-91' to each side of the equation. 91 + -91 + 21n = 7 + -91 Combine like terms: 91 + -91 = 0 0 + 21n = 7 + -91 21n = 7 + -91 Combine like terms: 7 + -91 = -84 21n = -84 Divide each side by '21'. n = -4 Simplifying n = -4
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