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Simplifying 7r + -1(3r + -20) = 20 Reorder the terms: 7r + -1(-20 + 3r) = 20 7r + (-20 * -1 + 3r * -1) = 20 7r + (20 + -3r) = 20 Reorder the terms: 20 + 7r + -3r = 20 Combine like terms: 7r + -3r = 4r 20 + 4r = 20 Add '-20' to each side of the equation. 20 + -20 + 4r = 20 + -20 Combine like terms: 20 + -20 = 0 0 + 4r = 20 + -20 4r = 20 + -20 Combine like terms: 20 + -20 = 0 4r = 0 Solving 4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '4'. r = 0 Simplifying r = 0
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