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Simplifying 4r + -20 = -8 + r Reorder the terms: -20 + 4r = -8 + r Solving -20 + 4r = -8 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -20 + 4r + -1r = -8 + r + -1r Combine like terms: 4r + -1r = 3r -20 + 3r = -8 + r + -1r Combine like terms: r + -1r = 0 -20 + 3r = -8 + 0 -20 + 3r = -8 Add '20' to each side of the equation. -20 + 20 + 3r = -8 + 20 Combine like terms: -20 + 20 = 0 0 + 3r = -8 + 20 3r = -8 + 20 Combine like terms: -8 + 20 = 12 3r = 12 Divide each side by '3'. r = 4 Simplifying r = 4
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