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Simplifying 57 = 12 + 3r Solving 57 = 12 + 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. 57 + -3r = 12 + 3r + -3r Combine like terms: 3r + -3r = 0 57 + -3r = 12 + 0 57 + -3r = 12 Add '-57' to each side of the equation. 57 + -57 + -3r = 12 + -57 Combine like terms: 57 + -57 = 0 0 + -3r = 12 + -57 -3r = 12 + -57 Combine like terms: 12 + -57 = -45 -3r = -45 Divide each side by '-3'. r = 15 Simplifying r = 15
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