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Simplifying 3r = 5(r + -20) Reorder the terms: 3r = 5(-20 + r) 3r = (-20 * 5 + r * 5) 3r = (-100 + 5r) Solving 3r = -100 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 3r + -5r = -100 + 5r + -5r Combine like terms: 3r + -5r = -2r -2r = -100 + 5r + -5r Combine like terms: 5r + -5r = 0 -2r = -100 + 0 -2r = -100 Divide each side by '-2'. r = 50 Simplifying r = 50
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