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Simplifying 3(-7r + 1) = 129 Reorder the terms: 3(1 + -7r) = 129 (1 * 3 + -7r * 3) = 129 (3 + -21r) = 129 Solving 3 + -21r = 129 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -21r = 129 + -3 Combine like terms: 3 + -3 = 0 0 + -21r = 129 + -3 -21r = 129 + -3 Combine like terms: 129 + -3 = 126 -21r = 126 Divide each side by '-21'. r = -6 Simplifying r = -6
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