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Simplifying -4(1 + 5r) + 9 = 0 (1 * -4 + 5r * -4) + 9 = 0 (-4 + -20r) + 9 = 0 Reorder the terms: -4 + 9 + -20r = 0 Combine like terms: -4 + 9 = 5 5 + -20r = 0 Solving 5 + -20r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -20r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -20r = 0 + -5 -20r = 0 + -5 Combine like terms: 0 + -5 = -5 -20r = -5 Divide each side by '-20'. r = 0.25 Simplifying r = 0.25
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