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Simplifying 3r + 8r = r + -7 + 8r + -7 Combine like terms: 3r + 8r = 11r 11r = r + -7 + 8r + -7 Reorder the terms: 11r = -7 + -7 + r + 8r Combine like terms: -7 + -7 = -14 11r = -14 + r + 8r Combine like terms: r + 8r = 9r 11r = -14 + 9r Solving 11r = -14 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 11r + -9r = -14 + 9r + -9r Combine like terms: 11r + -9r = 2r 2r = -14 + 9r + -9r Combine like terms: 9r + -9r = 0 2r = -14 + 0 2r = -14 Divide each side by '2'. r = -7 Simplifying r = -7
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