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Simplifying -5(4 + 20r) + -8r = 0 (4 * -5 + 20r * -5) + -8r = 0 (-20 + -100r) + -8r = 0 Combine like terms: -100r + -8r = -108r -20 + -108r = 0 Solving -20 + -108r = 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 + -108r = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -108r = 0 + 20 -108r = 0 + 20 Combine like terms: 0 + 20 = 20 -108r = 20 Divide each side by '-108'. r = -0.1851851852 Simplifying r = -0.1851851852
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