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Simplifying 4(5r + 45) = 0 Reorder the terms: 4(45 + 5r) = 0 (45 * 4 + 5r * 4) = 0 (180 + 20r) = 0 Solving 180 + 20r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-180' to each side of the equation. 180 + -180 + 20r = 0 + -180 Combine like terms: 180 + -180 = 0 0 + 20r = 0 + -180 20r = 0 + -180 Combine like terms: 0 + -180 = -180 20r = -180 Divide each side by '20'. r = -9 Simplifying r = -9
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