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Simplifying 81 = 3(k + 7) Reorder the terms: 81 = 3(7 + k) 81 = (7 * 3 + k * 3) 81 = (21 + 3k) Solving 81 = 21 + 3k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-3k' to each side of the equation. 81 + -3k = 21 + 3k + -3k Combine like terms: 3k + -3k = 0 81 + -3k = 21 + 0 81 + -3k = 21 Add '-81' to each side of the equation. 81 + -81 + -3k = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -3k = 21 + -81 -3k = 21 + -81 Combine like terms: 21 + -81 = -60 -3k = -60 Divide each side by '-3'. k = 20 Simplifying k = 20
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