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Simplifying 3(15 + r) + 3r = 291 (15 * 3 + r * 3) + 3r = 291 (45 + 3r) + 3r = 291 Combine like terms: 3r + 3r = 6r 45 + 6r = 291 Solving 45 + 6r = 291 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + 6r = 291 + -45 Combine like terms: 45 + -45 = 0 0 + 6r = 291 + -45 6r = 291 + -45 Combine like terms: 291 + -45 = 246 6r = 246 Divide each side by '6'. r = 41 Simplifying r = 41
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