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Simplifying -4(r + -2) + -8r = -20 + -5r Reorder the terms: -4(-2 + r) + -8r = -20 + -5r (-2 * -4 + r * -4) + -8r = -20 + -5r (8 + -4r) + -8r = -20 + -5r Combine like terms: -4r + -8r = -12r 8 + -12r = -20 + -5r Solving 8 + -12r = -20 + -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. 8 + -12r + 5r = -20 + -5r + 5r Combine like terms: -12r + 5r = -7r 8 + -7r = -20 + -5r + 5r Combine like terms: -5r + 5r = 0 8 + -7r = -20 + 0 8 + -7r = -20 Add '-8' to each side of the equation. 8 + -8 + -7r = -20 + -8 Combine like terms: 8 + -8 = 0 0 + -7r = -20 + -8 -7r = -20 + -8 Combine like terms: -20 + -8 = -28 -7r = -28 Divide each side by '-7'. r = 4 Simplifying r = 4
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