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Simplifying 315 = 15r Solving 315 = 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. 315 + -15r = 15r + -15r Combine like terms: 15r + -15r = 0 315 + -15r = 0 Add '-315' to each side of the equation. 315 + -315 + -15r = 0 + -315 Combine like terms: 315 + -315 = 0 0 + -15r = 0 + -315 -15r = 0 + -315 Combine like terms: 0 + -315 = -315 -15r = -315 Divide each side by '-15'. r = 21 Simplifying r = 21
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