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Simplifying 15 = 5 + -3r + 8r Combine like terms: -3r + 8r = 5r 15 = 5 + 5r Solving 15 = 5 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 15 + -5r = 5 + 5r + -5r Combine like terms: 5r + -5r = 0 15 + -5r = 5 + 0 15 + -5r = 5 Add '-15' to each side of the equation. 15 + -15 + -5r = 5 + -15 Combine like terms: 15 + -15 = 0 0 + -5r = 5 + -15 -5r = 5 + -15 Combine like terms: 5 + -15 = -10 -5r = -10 Divide each side by '-5'. r = 2 Simplifying r = 2
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