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Simplifying 13 + -8r + 4r = 4 + 5r Combine like terms: -8r + 4r = -4r 13 + -4r = 4 + 5r Solving 13 + -4r = 4 + 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. 13 + -4r + -5r = 4 + 5r + -5r Combine like terms: -4r + -5r = -9r 13 + -9r = 4 + 5r + -5r Combine like terms: 5r + -5r = 0 13 + -9r = 4 + 0 13 + -9r = 4 Add '-13' to each side of the equation. 13 + -13 + -9r = 4 + -13 Combine like terms: 13 + -13 = 0 0 + -9r = 4 + -13 -9r = 4 + -13 Combine like terms: 4 + -13 = -9 -9r = -9 Divide each side by '-9'. r = 1 Simplifying r = 1
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