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Simplifying 720 = 9r Solving 720 = 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. 720 + -9r = 9r + -9r Combine like terms: 9r + -9r = 0 720 + -9r = 0 Add '-720' to each side of the equation. 720 + -720 + -9r = 0 + -720 Combine like terms: 720 + -720 = 0 0 + -9r = 0 + -720 -9r = 0 + -720 Combine like terms: 0 + -720 = -720 -9r = -720 Divide each side by '-9'. r = 80 Simplifying r = 80
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