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Simplifying (9 + -3r) * 3 + 4r = 129 Reorder the terms for easier multiplication: 3(9 + -3r) + 4r = 129 (9 * 3 + -3r * 3) + 4r = 129 (27 + -9r) + 4r = 129 Combine like terms: -9r + 4r = -5r 27 + -5r = 129 Solving 27 + -5r = 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 + -5r = 129 + -27 Combine like terms: 27 + -27 = 0 0 + -5r = 129 + -27 -5r = 129 + -27 Combine like terms: 129 + -27 = 102 -5r = 102 Divide each side by '-5'. r = -20.4 Simplifying r = -20.4
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