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Simplifying 13 = 18 + -5r Solving 13 = 18 + -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 + 5r = 18 + -5r + 5r Combine like terms: -5r + 5r = 0 13 + 5r = 18 + 0 13 + 5r = 18 Add '-13' to each side of the equation. 13 + -13 + 5r = 18 + -13 Combine like terms: 13 + -13 = 0 0 + 5r = 18 + -13 5r = 18 + -13 Combine like terms: 18 + -13 = 5 5r = 5 Divide each side by '5'. r = 1 Simplifying r = 1
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