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Simplifying 13r + 9 = 57 + -3r Reorder the terms: 9 + 13r = 57 + -3r Solving 9 + 13r = 57 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 9 + 13r + 3r = 57 + -3r + 3r Combine like terms: 13r + 3r = 16r 9 + 16r = 57 + -3r + 3r Combine like terms: -3r + 3r = 0 9 + 16r = 57 + 0 9 + 16r = 57 Add '-9' to each side of the equation. 9 + -9 + 16r = 57 + -9 Combine like terms: 9 + -9 = 0 0 + 16r = 57 + -9 16r = 57 + -9 Combine like terms: 57 + -9 = 48 16r = 48 Divide each side by '16'. r = 3 Simplifying r = 3
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