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Simplifying 18 = 3(r + 12) Reorder the terms: 18 = 3(12 + r) 18 = (12 * 3 + r * 3) 18 = (36 + 3r) Solving 18 = 36 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 18 + -3r = 36 + 3r + -3r Combine like terms: 3r + -3r = 0 18 + -3r = 36 + 0 18 + -3r = 36 Add '-18' to each side of the equation. 18 + -18 + -3r = 36 + -18 Combine like terms: 18 + -18 = 0 0 + -3r = 36 + -18 -3r = 36 + -18 Combine like terms: 36 + -18 = 18 -3r = 18 Divide each side by '-3'. r = -6 Simplifying r = -6
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