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Simplifying 80 = r + r Combine like terms: r + r = 2r 80 = 2r Solving 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. 80 + -2r = 2r + -2r Combine like terms: 2r + -2r = 0 80 + -2r = 0 Add '-80' to each side of the equation. 80 + -80 + -2r = 0 + -80 Combine like terms: 80 + -80 = 0 0 + -2r = 0 + -80 -2r = 0 + -80 Combine like terms: 0 + -80 = -80 -2r = -80 Divide each side by '-2'. r = 40 Simplifying r = 40
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