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Simplifying -3(1 + -5r) + 7 = 124 (1 * -3 + -5r * -3) + 7 = 124 (-3 + 15r) + 7 = 124 Reorder the terms: -3 + 7 + 15r = 124 Combine like terms: -3 + 7 = 4 4 + 15r = 124 Solving 4 + 15r = 124 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 15r = 124 + -4 Combine like terms: 4 + -4 = 0 0 + 15r = 124 + -4 15r = 124 + -4 Combine like terms: 124 + -4 = 120 15r = 120 Divide each side by '15'. r = 8 Simplifying r = 8
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