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Simplifying 15 = 8r + 3 + r Reorder the terms: 15 = 3 + 8r + r Combine like terms: 8r + r = 9r 15 = 3 + 9r Solving 15 = 3 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 15 + -9r = 3 + 9r + -9r Combine like terms: 9r + -9r = 0 15 + -9r = 3 + 0 15 + -9r = 3 Add '-15' to each side of the equation. 15 + -15 + -9r = 3 + -15 Combine like terms: 15 + -15 = 0 0 + -9r = 3 + -15 -9r = 3 + -15 Combine like terms: 3 + -15 = -12 -9r = -12 Divide each side by '-9'. r = 1.333333333 Simplifying r = 1.333333333
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