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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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