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Simplifying 5(4 + 5r) = -180 (4 * 5 + 5r * 5) = -180 (20 + 25r) = -180 Solving 20 + 25r = -180 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 + 25r = -180 + -20 Combine like terms: 20 + -20 = 0 0 + 25r = -180 + -20 25r = -180 + -20 Combine like terms: -180 + -20 = -200 25r = -200 Divide each side by '25'. r = -8 Simplifying r = -8
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