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Simplifying 39 = -13r Solving 39 = -13r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '13r' to each side of the equation. 39 + 13r = -13r + 13r Combine like terms: -13r + 13r = 0 39 + 13r = 0 Add '-39' to each side of the equation. 39 + -39 + 13r = 0 + -39 Combine like terms: 39 + -39 = 0 0 + 13r = 0 + -39 13r = 0 + -39 Combine like terms: 0 + -39 = -39 13r = -39 Divide each side by '13'. r = -3 Simplifying r = -3
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