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Simplifying 72 = 2(6r + 6) Reorder the terms: 72 = 2(6 + 6r) 72 = (6 * 2 + 6r * 2) 72 = (12 + 12r) Solving 72 = 12 + 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 = 12 + 12r + -12r Combine like terms: 12r + -12r = 0 72 + -12r = 12 + 0 72 + -12r = 12 Add '-72' to each side of the equation. 72 + -72 + -12r = 12 + -72 Combine like terms: 72 + -72 = 0 0 + -12r = 12 + -72 -12r = 12 + -72 Combine like terms: 12 + -72 = -60 -12r = -60 Divide each side by '-12'. r = 5 Simplifying r = 5
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