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Simplifying r + 2(r + 6) = 39 Reorder the terms: r + 2(6 + r) = 39 r + (6 * 2 + r * 2) = 39 r + (12 + 2r) = 39 Reorder the terms: 12 + r + 2r = 39 Combine like terms: r + 2r = 3r 12 + 3r = 39 Solving 12 + 3r = 39 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3r = 39 + -12 Combine like terms: 12 + -12 = 0 0 + 3r = 39 + -12 3r = 39 + -12 Combine like terms: 39 + -12 = 27 3r = 27 Divide each side by '3'. r = 9 Simplifying r = 9
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