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Simplifying -81 = 3(1 + -7n) -81 = (1 * 3 + -7n * 3) -81 = (3 + -21n) Solving -81 = 3 + -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. -81 + 21n = 3 + -21n + 21n Combine like terms: -21n + 21n = 0 -81 + 21n = 3 + 0 -81 + 21n = 3 Add '81' to each side of the equation. -81 + 81 + 21n = 3 + 81 Combine like terms: -81 + 81 = 0 0 + 21n = 3 + 81 21n = 3 + 81 Combine like terms: 3 + 81 = 84 21n = 84 Divide each side by '21'. n = 4 Simplifying n = 4
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