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Simplifying 3 = 13 + -2r Solving 3 = 13 + -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. 3 + 2r = 13 + -2r + 2r Combine like terms: -2r + 2r = 0 3 + 2r = 13 + 0 3 + 2r = 13 Add '-3' to each side of the equation. 3 + -3 + 2r = 13 + -3 Combine like terms: 3 + -3 = 0 0 + 2r = 13 + -3 2r = 13 + -3 Combine like terms: 13 + -3 = 10 2r = 10 Divide each side by '2'. r = 5 Simplifying r = 5
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