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