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Simplifying -13 = 5 + 9r Solving -13 = 5 + 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. -13 + -9r = 5 + 9r + -9r Combine like terms: 9r + -9r = 0 -13 + -9r = 5 + 0 -13 + -9r = 5 Add '13' to each side of the equation. -13 + 13 + -9r = 5 + 13 Combine like terms: -13 + 13 = 0 0 + -9r = 5 + 13 -9r = 5 + 13 Combine like terms: 5 + 13 = 18 -9r = 18 Divide each side by '-9'. r = -2 Simplifying r = -2
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