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Simplifying 4 + 8 = 13 + -2r Combine like terms: 4 + 8 = 12 12 = 13 + -2r Solving 12 = 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. 12 + 2r = 13 + -2r + 2r Combine like terms: -2r + 2r = 0 12 + 2r = 13 + 0 12 + 2r = 13 Add '-12' to each side of the equation. 12 + -12 + 2r = 13 + -12 Combine like terms: 12 + -12 = 0 0 + 2r = 13 + -12 2r = 13 + -12 Combine like terms: 13 + -12 = 1 2r = 1 Divide each side by '2'. r = 0.5 Simplifying r = 0.5
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