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Simplifying 20 = 2r Solving 20 = 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. 20 + -2r = 2r + -2r Combine like terms: 2r + -2r = 0 20 + -2r = 0 Add '-20' to each side of the equation. 20 + -20 + -2r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -2r = 0 + -20 -2r = 0 + -20 Combine like terms: 0 + -20 = -20 -2r = -20 Divide each side by '-2'. r = 10 Simplifying r = 10
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