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Simplifying 2(r + 12) = 390 Reorder the terms: 2(12 + r) = 390 (12 * 2 + r * 2) = 390 (24 + 2r) = 390 Solving 24 + 2r = 390 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + 2r = 390 + -24 Combine like terms: 24 + -24 = 0 0 + 2r = 390 + -24 2r = 390 + -24 Combine like terms: 390 + -24 = 366 2r = 366 Divide each side by '2'. r = 183 Simplifying r = 183
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