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Simplifying r + -20 = 4 + 6 + -4r Reorder the terms: -20 + r = 4 + 6 + -4r Combine like terms: 4 + 6 = 10 -20 + r = 10 + -4r Solving -20 + r = 10 + -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 + r + 4r = 10 + -4r + 4r Combine like terms: r + 4r = 5r -20 + 5r = 10 + -4r + 4r Combine like terms: -4r + 4r = 0 -20 + 5r = 10 + 0 -20 + 5r = 10 Add '20' to each side of the equation. -20 + 20 + 5r = 10 + 20 Combine like terms: -20 + 20 = 0 0 + 5r = 10 + 20 5r = 10 + 20 Combine like terms: 10 + 20 = 30 5r = 30 Divide each side by '5'. r = 6 Simplifying r = 6
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