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Simplifying 80 + -3r = 5r + -80 Reorder the terms: 80 + -3r = -80 + 5r Solving 80 + -3r = -80 + 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. 80 + -3r + -5r = -80 + 5r + -5r Combine like terms: -3r + -5r = -8r 80 + -8r = -80 + 5r + -5r Combine like terms: 5r + -5r = 0 80 + -8r = -80 + 0 80 + -8r = -80 Add '-80' to each side of the equation. 80 + -80 + -8r = -80 + -80 Combine like terms: 80 + -80 = 0 0 + -8r = -80 + -80 -8r = -80 + -80 Combine like terms: -80 + -80 = -160 -8r = -160 Divide each side by '-8'. r = 20 Simplifying r = 20
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