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Simplifying 3r + 3(r + 20) = 225 Reorder the terms: 3r + 3(20 + r) = 225 3r + (20 * 3 + r * 3) = 225 3r + (60 + 3r) = 225 Reorder the terms: 60 + 3r + 3r = 225 Combine like terms: 3r + 3r = 6r 60 + 6r = 225 Solving 60 + 6r = 225 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 + 6r = 225 + -60 Combine like terms: 60 + -60 = 0 0 + 6r = 225 + -60 6r = 225 + -60 Combine like terms: 225 + -60 = 165 6r = 165 Divide each side by '6'. r = 27.5 Simplifying r = 27.5
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