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Simplifying 4r + 3(3r + -9) = 129 Reorder the terms: 4r + 3(-9 + 3r) = 129 4r + (-9 * 3 + 3r * 3) = 129 4r + (-27 + 9r) = 129 Reorder the terms: -27 + 4r + 9r = 129 Combine like terms: 4r + 9r = 13r -27 + 13r = 129 Solving -27 + 13r = 129 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '27' to each side of the equation. -27 + 27 + 13r = 129 + 27 Combine like terms: -27 + 27 = 0 0 + 13r = 129 + 27 13r = 129 + 27 Combine like terms: 129 + 27 = 156 13r = 156 Divide each side by '13'. r = 12 Simplifying r = 12
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