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Simplifying 5(5r + -9) = 199 Reorder the terms: 5(-9 + 5r) = 199 (-9 * 5 + 5r * 5) = 199 (-45 + 25r) = 199 Solving -45 + 25r = 199 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + 25r = 199 + 45 Combine like terms: -45 + 45 = 0 0 + 25r = 199 + 45 25r = 199 + 45 Combine like terms: 199 + 45 = 244 25r = 244 Divide each side by '25'. r = 9.76 Simplifying r = 9.76
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