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Simplifying 7r + 2(3r + 12) = 63 Reorder the terms: 7r + 2(12 + 3r) = 63 7r + (12 * 2 + 3r * 2) = 63 7r + (24 + 6r) = 63 Reorder the terms: 24 + 7r + 6r = 63 Combine like terms: 7r + 6r = 13r 24 + 13r = 63 Solving 24 + 13r = 63 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 + 13r = 63 + -24 Combine like terms: 24 + -24 = 0 0 + 13r = 63 + -24 13r = 63 + -24 Combine like terms: 63 + -24 = 39 13r = 39 Divide each side by '13'. r = 3 Simplifying r = 3
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