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Simplifying 81 = 9(r + 5) Reorder the terms: 81 = 9(5 + r) 81 = (5 * 9 + r * 9) 81 = (45 + 9r) Solving 81 = 45 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 81 + -9r = 45 + 9r + -9r Combine like terms: 9r + -9r = 0 81 + -9r = 45 + 0 81 + -9r = 45 Add '-81' to each side of the equation. 81 + -81 + -9r = 45 + -81 Combine like terms: 81 + -81 = 0 0 + -9r = 45 + -81 -9r = 45 + -81 Combine like terms: 45 + -81 = -36 -9r = -36 Divide each side by '-9'. r = 4 Simplifying r = 4
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