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Simplifying -5 = 0.25(4 + 20r) -5 = (4 * 0.25 + 20r * 0.25) -5 = (1 + 5r) Solving -5 = 1 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. -5 + -5r = 1 + 5r + -5r Combine like terms: 5r + -5r = 0 -5 + -5r = 1 + 0 -5 + -5r = 1 Add '5' to each side of the equation. -5 + 5 + -5r = 1 + 5 Combine like terms: -5 + 5 = 0 0 + -5r = 1 + 5 -5r = 1 + 5 Combine like terms: 1 + 5 = 6 -5r = 6 Divide each side by '-5'. r = -1.2 Simplifying r = -1.2
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