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Simplifying 5r + -4r = 4r + -8r + 15 Combine like terms: 5r + -4r = 1r 1r = 4r + -8r + 15 Reorder the terms: 1r = 15 + 4r + -8r Combine like terms: 4r + -8r = -4r 1r = 15 + -4r Solving 1r = 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. 1r + 4r = 15 + -4r + 4r Combine like terms: 1r + 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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