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Simplifying 39 = 15 + r Solving 39 = 15 + 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. 39 + -1r = 15 + r + -1r Combine like terms: r + -1r = 0 39 + -1r = 15 + 0 39 + -1r = 15 Add '-39' to each side of the equation. 39 + -39 + -1r = 15 + -39 Combine like terms: 39 + -39 = 0 0 + -1r = 15 + -39 -1r = 15 + -39 Combine like terms: 15 + -39 = -24 -1r = -24 Divide each side by '-1'. r = 24 Simplifying r = 24
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