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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 = 69 -3r = 69 Divide each side by '-3'. r = -23 Simplifying r = -23
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