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Simplifying 15 + -1r = 4r Solving 15 + -1r = 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. 15 + -1r + -4r = 4r + -4r Combine like terms: -1r + -4r = -5r 15 + -5r = 4r + -4r Combine like terms: 4r + -4r = 0 15 + -5r = 0 Add '-15' to each side of the equation. 15 + -15 + -5r = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -5r = 0 + -15 -5r = 0 + -15 Combine like terms: 0 + -15 = -15 -5r = -15 Divide each side by '-5'. r = 3 Simplifying r = 3
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