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Simplifying 72 = -12r + 9 Reorder the terms: 72 = 9 + -12r Solving 72 = 9 + -12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12r' to each side of the equation. 72 + 12r = 9 + -12r + 12r Combine like terms: -12r + 12r = 0 72 + 12r = 9 + 0 72 + 12r = 9 Add '-72' to each side of the equation. 72 + -72 + 12r = 9 + -72 Combine like terms: 72 + -72 = 0 0 + 12r = 9 + -72 12r = 9 + -72 Combine like terms: 9 + -72 = -63 12r = -63 Divide each side by '12'. r = -5.25 Simplifying r = -5.25
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