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Simplifying 3(r + 3) = 30 Reorder the terms: 3(3 + r) = 30 (3 * 3 + r * 3) = 30 (9 + 3r) = 30 Solving 9 + 3r = 30 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3r = 30 + -9 Combine like terms: 9 + -9 = 0 0 + 3r = 30 + -9 3r = 30 + -9 Combine like terms: 30 + -9 = 21 3r = 21 Divide each side by '3'. r = 7 Simplifying r = 7
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