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Simplifying 3r + -12 = -57 Reorder the terms: -12 + 3r = -57 Solving -12 + 3r = -57 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 3r = -57 + 12 Combine like terms: -12 + 12 = 0 0 + 3r = -57 + 12 3r = -57 + 12 Combine like terms: -57 + 12 = -45 3r = -45 Divide each side by '3'. r = -15 Simplifying r = -15
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