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Simplifying r + 20 = 35 + -4r Reorder the terms: 20 + r = 35 + -4r Solving 20 + r = 35 + -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 = 35 + -4r + 4r Combine like terms: r + 4r = 5r 20 + 5r = 35 + -4r + 4r Combine like terms: -4r + 4r = 0 20 + 5r = 35 + 0 20 + 5r = 35 Add '-20' to each side of the equation. 20 + -20 + 5r = 35 + -20 Combine like terms: 20 + -20 = 0 0 + 5r = 35 + -20 5r = 35 + -20 Combine like terms: 35 + -20 = 15 5r = 15 Divide each side by '5'. r = 3 Simplifying r = 3
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