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Simplifying -8 + 7(1 + 3r) = 125 -8 + (1 * 7 + 3r * 7) = 125 -8 + (7 + 21r) = 125 Combine like terms: -8 + 7 = -1 -1 + 21r = 125 Solving -1 + 21r = 125 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 21r = 125 + 1 Combine like terms: -1 + 1 = 0 0 + 21r = 125 + 1 21r = 125 + 1 Combine like terms: 125 + 1 = 126 21r = 126 Divide each side by '21'. r = 6 Simplifying r = 6
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