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Simplifying r = 15 + -4r Solving r = 15 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. r + 4r = 15 + -4r + 4r Combine like terms: r + 4r = 5r 5r = 15 + -4r + 4r Combine like terms: -4r + 4r = 0 5r = 15 + 0 5r = 15 Divide each side by '5'. r = 3 Simplifying r = 3
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