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Simplifying 117 + -9r = 0 Solving 117 + -9r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-117' to each side of the equation. 117 + -117 + -9r = 0 + -117 Combine like terms: 117 + -117 = 0 0 + -9r = 0 + -117 -9r = 0 + -117 Combine like terms: 0 + -117 = -117 -9r = -117 Divide each side by '-9'. r = 13 Simplifying r = 13
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