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Simplifying 3r + 10 + 2r + -20 = 180 Reorder the terms: 10 + -20 + 3r + 2r = 180 Combine like terms: 10 + -20 = -10 -10 + 3r + 2r = 180 Combine like terms: 3r + 2r = 5r -10 + 5r = 180 Solving -10 + 5r = 180 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 5r = 180 + 10 Combine like terms: -10 + 10 = 0 0 + 5r = 180 + 10 5r = 180 + 10 Combine like terms: 180 + 10 = 190 5r = 190 Divide each side by '5'. r = 38 Simplifying r = 38
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