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Simplifying 8r + -1(20r + 4) * 0.25 = -12 Reorder the terms: 8r + -1(4 + 20r) * 0.25 = -12 Reorder the terms for easier multiplication: 8r + -1 * 0.25(4 + 20r) = -12 Multiply -1 * 0.25 8r + -0.25(4 + 20r) = -12 8r + (4 * -0.25 + 20r * -0.25) = -12 8r + (-1 + -5r) = -12 Reorder the terms: -1 + 8r + -5r = -12 Combine like terms: 8r + -5r = 3r -1 + 3r = -12 Solving -1 + 3r = -12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 3r = -12 + 1 Combine like terms: -1 + 1 = 0 0 + 3r = -12 + 1 3r = -12 + 1 Combine like terms: -12 + 1 = -11 3r = -11 Divide each side by '3'. r = -3.666666667 Simplifying r = -3.666666667
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