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Simplifying r + 2 + 1 = -13 + 5r Reorder the terms: 2 + 1 + r = -13 + 5r Combine like terms: 2 + 1 = 3 3 + r = -13 + 5r Solving 3 + r = -13 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 3 + r + -5r = -13 + 5r + -5r Combine like terms: r + -5r = -4r 3 + -4r = -13 + 5r + -5r Combine like terms: 5r + -5r = 0 3 + -4r = -13 + 0 3 + -4r = -13 Add '-3' to each side of the equation. 3 + -3 + -4r = -13 + -3 Combine like terms: 3 + -3 = 0 0 + -4r = -13 + -3 -4r = -13 + -3 Combine like terms: -13 + -3 = -16 -4r = -16 Divide each side by '-4'. r = 4 Simplifying r = 4
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