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Simplifying r + 3 + r + 2(r + 3) = 57 Reorder the terms: r + 3 + r + 2(3 + r) = 57 r + 3 + r + (3 * 2 + r * 2) = 57 r + 3 + r + (6 + 2r) = 57 Reorder the terms: 3 + 6 + r + r + 2r = 57 Combine like terms: 3 + 6 = 9 9 + r + r + 2r = 57 Combine like terms: r + r = 2r 9 + 2r + 2r = 57 Combine like terms: 2r + 2r = 4r 9 + 4r = 57 Solving 9 + 4r = 57 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 4r = 57 + -9 Combine like terms: 9 + -9 = 0 0 + 4r = 57 + -9 4r = 57 + -9 Combine like terms: 57 + -9 = 48 4r = 48 Divide each side by '4'. r = 12 Simplifying r = 12
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