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Simplifying 13 + 5r = 2(5 + 2r) 13 + 5r = (5 * 2 + 2r * 2) 13 + 5r = (10 + 4r) Solving 13 + 5r = 10 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 13 + 5r + -4r = 10 + 4r + -4r Combine like terms: 5r + -4r = 1r 13 + 1r = 10 + 4r + -4r Combine like terms: 4r + -4r = 0 13 + 1r = 10 + 0 13 + 1r = 10 Add '-13' to each side of the equation. 13 + -13 + 1r = 10 + -13 Combine like terms: 13 + -13 = 0 0 + 1r = 10 + -13 1r = 10 + -13 Combine like terms: 10 + -13 = -3 1r = -3 Divide each side by '1'. r = -3 Simplifying r = -3
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