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Simplifying 15 = -8r + -1 + -8 Reorder the terms: 15 = -1 + -8 + -8r Combine like terms: -1 + -8 = -9 15 = -9 + -8r Solving 15 = -9 + -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. 15 + 8r = -9 + -8r + 8r Combine like terms: -8r + 8r = 0 15 + 8r = -9 + 0 15 + 8r = -9 Add '-15' to each side of the equation. 15 + -15 + 8r = -9 + -15 Combine like terms: 15 + -15 = 0 0 + 8r = -9 + -15 8r = -9 + -15 Combine like terms: -9 + -15 = -24 8r = -24 Divide each side by '8'. r = -3 Simplifying r = -3
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