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Simplifying 10(r + 8) = 140 Reorder the terms: 10(8 + r) = 140 (8 * 10 + r * 10) = 140 (80 + 10r) = 140 Solving 80 + 10r = 140 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-80' to each side of the equation. 80 + -80 + 10r = 140 + -80 Combine like terms: 80 + -80 = 0 0 + 10r = 140 + -80 10r = 140 + -80 Combine like terms: 140 + -80 = 60 10r = 60 Divide each side by '10'. r = 6 Simplifying r = 6
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