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Simplifying 3(r + 20) + 4r = 81 Reorder the terms: 3(20 + r) + 4r = 81 (20 * 3 + r * 3) + 4r = 81 (60 + 3r) + 4r = 81 Combine like terms: 3r + 4r = 7r 60 + 7r = 81 Solving 60 + 7r = 81 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-60' to each side of the equation. 60 + -60 + 7r = 81 + -60 Combine like terms: 60 + -60 = 0 0 + 7r = 81 + -60 7r = 81 + -60 Combine like terms: 81 + -60 = 21 7r = 21 Divide each side by '7'. r = 3 Simplifying r = 3
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