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Simplifying 13 + 39 = r * 13 Combine like terms: 13 + 39 = 52 52 = r * 13 Reorder the terms for easier multiplication: 52 = 13r Solving 52 = 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. 52 + -13r = 13r + -13r Combine like terms: 13r + -13r = 0 52 + -13r = 0 Add '-52' to each side of the equation. 52 + -52 + -13r = 0 + -52 Combine like terms: 52 + -52 = 0 0 + -13r = 0 + -52 -13r = 0 + -52 Combine like terms: 0 + -52 = -52 -13r = -52 Divide each side by '-13'. r = 4 Simplifying r = 4
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