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Simplifying 13 = 3r + 5 + r Reorder the terms: 13 = 5 + 3r + r Combine like terms: 3r + r = 4r 13 = 5 + 4r Solving 13 = 5 + 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 + -4r = 5 + 4r + -4r Combine like terms: 4r + -4r = 0 13 + -4r = 5 + 0 13 + -4r = 5 Add '-13' to each side of the equation. 13 + -13 + -4r = 5 + -13 Combine like terms: 13 + -13 = 0 0 + -4r = 5 + -13 -4r = 5 + -13 Combine like terms: 5 + -13 = -8 -4r = -8 Divide each side by '-4'. r = 2 Simplifying r = 2
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