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Simplifying 20 = r + 8 + -5r Reorder the terms: 20 = 8 + r + -5r Combine like terms: r + -5r = -4r 20 = 8 + -4r Solving 20 = 8 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 20 + 4r = 8 + -4r + 4r Combine like terms: -4r + 4r = 0 20 + 4r = 8 + 0 20 + 4r = 8 Add '-20' to each side of the equation. 20 + -20 + 4r = 8 + -20 Combine like terms: 20 + -20 = 0 0 + 4r = 8 + -20 4r = 8 + -20 Combine like terms: 8 + -20 = -12 4r = -12 Divide each side by '4'. r = -3 Simplifying r = -3
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