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Simplifying 80 = 23 + -3r Solving 80 = 23 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 80 + 3r = 23 + -3r + 3r Combine like terms: -3r + 3r = 0 80 + 3r = 23 + 0 80 + 3r = 23 Add '-80' to each side of the equation. 80 + -80 + 3r = 23 + -80 Combine like terms: 80 + -80 = 0 0 + 3r = 23 + -80 3r = 23 + -80 Combine like terms: 23 + -80 = -57 3r = -57 Divide each side by '3'. r = -19 Simplifying r = -19
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