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Simplifying 10(r + 28) = 580 Reorder the terms: 10(28 + r) = 580 (28 * 10 + r * 10) = 580 (280 + 10r) = 580 Solving 280 + 10r = 580 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-280' to each side of the equation. 280 + -280 + 10r = 580 + -280 Combine like terms: 280 + -280 = 0 0 + 10r = 580 + -280 10r = 580 + -280 Combine like terms: 580 + -280 = 300 10r = 300 Divide each side by '10'. r = 30 Simplifying r = 30
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