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Simplifying -5(4 + -9r) = 0 (4 * -5 + -9r * -5) = 0 (-20 + 45r) = 0 Solving -20 + 45r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 45r = 0 + 20 Combine like terms: -20 + 20 = 0 0 + 45r = 0 + 20 45r = 0 + 20 Combine like terms: 0 + 20 = 20 45r = 20 Divide each side by '45'. r = 0.4444444444 Simplifying r = 0.4444444444
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