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Simplifying 9 + 5r = -7 + -8r Solving 9 + 5r = -7 + -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. 9 + 5r + 8r = -7 + -8r + 8r Combine like terms: 5r + 8r = 13r 9 + 13r = -7 + -8r + 8r Combine like terms: -8r + 8r = 0 9 + 13r = -7 + 0 9 + 13r = -7 Add '-9' to each side of the equation. 9 + -9 + 13r = -7 + -9 Combine like terms: 9 + -9 = 0 0 + 13r = -7 + -9 13r = -7 + -9 Combine like terms: -7 + -9 = -16 13r = -16 Divide each side by '13'. r = -1.230769231 Simplifying r = -1.230769231
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