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Simplifying 3r + 3(r + 15) = 225 Reorder the terms: 3r + 3(15 + r) = 225 3r + (15 * 3 + r * 3) = 225 3r + (45 + 3r) = 225 Reorder the terms: 45 + 3r + 3r = 225 Combine like terms: 3r + 3r = 6r 45 + 6r = 225 Solving 45 + 6r = 225 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 = 225 + -45 Combine like terms: 45 + -45 = 0 0 + 6r = 225 + -45 6r = 225 + -45 Combine like terms: 225 + -45 = 180 6r = 180 Divide each side by '6'. r = 30 Simplifying r = 30
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