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Simplifying -4r + 15 = r Reorder the terms: 15 + -4r = r Solving 15 + -4r = r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 15 + -4r + -1r = r + -1r Combine like terms: -4r + -1r = -5r 15 + -5r = r + -1r Combine like terms: r + -1r = 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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