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Simplifying 15 + 8r = 7r Solving 15 + 8r = 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. 15 + 8r + -7r = 7r + -7r Combine like terms: 8r + -7r = 1r 15 + 1r = 7r + -7r Combine like terms: 7r + -7r = 0 15 + 1r = 0 Add '-15' to each side of the equation. 15 + -15 + 1r = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 1r = 0 + -15 1r = 0 + -15 Combine like terms: 0 + -15 = -15 1r = -15 Divide each side by '1'. r = -15 Simplifying r = -15
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