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Simplifying 8r + -20 = -1(-2r + -4) Reorder the terms: -20 + 8r = -1(-2r + -4) Reorder the terms: -20 + 8r = -1(-4 + -2r) -20 + 8r = (-4 * -1 + -2r * -1) -20 + 8r = (4 + 2r) Solving -20 + 8r = 4 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -20 + 8r + -2r = 4 + 2r + -2r Combine like terms: 8r + -2r = 6r -20 + 6r = 4 + 2r + -2r Combine like terms: 2r + -2r = 0 -20 + 6r = 4 + 0 -20 + 6r = 4 Add '20' to each side of the equation. -20 + 20 + 6r = 4 + 20 Combine like terms: -20 + 20 = 0 0 + 6r = 4 + 20 6r = 4 + 20 Combine like terms: 4 + 20 = 24 6r = 24 Divide each side by '6'. r = 4 Simplifying r = 4
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