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Simplifying 40 = -2r + 80 Reorder the terms: 40 = 80 + -2r Solving 40 = 80 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. 40 + 2r = 80 + -2r + 2r Combine like terms: -2r + 2r = 0 40 + 2r = 80 + 0 40 + 2r = 80 Add '-40' to each side of the equation. 40 + -40 + 2r = 80 + -40 Combine like terms: 40 + -40 = 0 0 + 2r = 80 + -40 2r = 80 + -40 Combine like terms: 80 + -40 = 40 2r = 40 Divide each side by '2'. r = 20 Simplifying r = 20
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