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Simplifying 57 = 4r + 13 Reorder the terms: 57 = 13 + 4r Solving 57 = 13 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 57 + -4r = 13 + 4r + -4r Combine like terms: 4r + -4r = 0 57 + -4r = 13 + 0 57 + -4r = 13 Add '-57' to each side of the equation. 57 + -57 + -4r = 13 + -57 Combine like terms: 57 + -57 = 0 0 + -4r = 13 + -57 -4r = 13 + -57 Combine like terms: 13 + -57 = -44 -4r = -44 Divide each side by '-4'. r = 11 Simplifying r = 11
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