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Simplifying 13 = 18 + r Solving 13 = 18 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 13 + -1r = 18 + r + -1r Combine like terms: r + -1r = 0 13 + -1r = 18 + 0 13 + -1r = 18 Add '-13' to each side of the equation. 13 + -13 + -1r = 18 + -13 Combine like terms: 13 + -13 = 0 0 + -1r = 18 + -13 -1r = 18 + -13 Combine like terms: 18 + -13 = 5 -1r = 5 Divide each side by '-1'. r = -5 Simplifying r = -5
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