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Simplifying 13 = 2 + r Solving 13 = 2 + 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 = 2 + r + -1r Combine like terms: r + -1r = 0 13 + -1r = 2 + 0 13 + -1r = 2 Add '-13' to each side of the equation. 13 + -13 + -1r = 2 + -13 Combine like terms: 13 + -13 = 0 0 + -1r = 2 + -13 -1r = 2 + -13 Combine like terms: 2 + -13 = -11 -1r = -11 Divide each side by '-1'. r = 11 Simplifying r = 11
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