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Simplifying -5 = 0.25(4 + 20r) + -2r -5 = (4 * 0.25 + 20r * 0.25) + -2r -5 = (1 + 5r) + -2r Combine like terms: 5r + -2r = 3r -5 = 1 + 3r Solving -5 = 1 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -5 + -3r = 1 + 3r + -3r Combine like terms: 3r + -3r = 0 -5 + -3r = 1 + 0 -5 + -3r = 1 Add '5' to each side of the equation. -5 + 5 + -3r = 1 + 5 Combine like terms: -5 + 5 = 0 0 + -3r = 1 + 5 -3r = 1 + 5 Combine like terms: 1 + 5 = 6 -3r = 6 Divide each side by '-3'. r = -2 Simplifying r = -2
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