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Simplifying -5r + 15 = -7r + 7r Reorder the terms: 15 + -5r = -7r + 7r Combine like terms: -7r + 7r = 0 15 + -5r = 0 Solving 15 + -5r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. 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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