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Simplifying 9r + 8 = 2r + -13 Reorder the terms: 8 + 9r = 2r + -13 Reorder the terms: 8 + 9r = -13 + 2r Solving 8 + 9r = -13 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 8 + 9r + -2r = -13 + 2r + -2r Combine like terms: 9r + -2r = 7r 8 + 7r = -13 + 2r + -2r Combine like terms: 2r + -2r = 0 8 + 7r = -13 + 0 8 + 7r = -13 Add '-8' to each side of the equation. 8 + -8 + 7r = -13 + -8 Combine like terms: 8 + -8 = 0 0 + 7r = -13 + -8 7r = -13 + -8 Combine like terms: -13 + -8 = -21 7r = -21 Divide each side by '7'. r = -3 Simplifying r = -3
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