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Simplifying -55 = 0.25(4 + 20r) + -8r -55 = (4 * 0.25 + 20r * 0.25) + -8r -55 = (1 + 5r) + -8r Combine like terms: 5r + -8r = -3r -55 = 1 + -3r Solving -55 = 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. -55 + 3r = 1 + -3r + 3r Combine like terms: -3r + 3r = 0 -55 + 3r = 1 + 0 -55 + 3r = 1 Add '55' to each side of the equation. -55 + 55 + 3r = 1 + 55 Combine like terms: -55 + 55 = 0 0 + 3r = 1 + 55 3r = 1 + 55 Combine like terms: 1 + 55 = 56 3r = 56 Divide each side by '3'. r = 18.66666667 Simplifying r = 18.66666667
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