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Simplifying 3(r + 12) = 7r Reorder the terms: 3(12 + r) = 7r (12 * 3 + r * 3) = 7r (36 + 3r) = 7r Solving 36 + 3r = 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. 36 + 3r + -7r = 7r + -7r Combine like terms: 3r + -7r = -4r 36 + -4r = 7r + -7r Combine like terms: 7r + -7r = 0 36 + -4r = 0 Add '-36' to each side of the equation. 36 + -36 + -4r = 0 + -36 Combine like terms: 36 + -36 = 0 0 + -4r = 0 + -36 -4r = 0 + -36 Combine like terms: 0 + -36 = -36 -4r = -36 Divide each side by '-4'. r = 9 Simplifying r = 9
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