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Simplifying -57 = -12 + 4r Solving -57 = -12 + 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 = -12 + 4r + -4r Combine like terms: 4r + -4r = 0 -57 + -4r = -12 + 0 -57 + -4r = -12 Add '57' to each side of the equation. -57 + 57 + -4r = -12 + 57 Combine like terms: -57 + 57 = 0 0 + -4r = -12 + 57 -4r = -12 + 57 Combine like terms: -12 + 57 = 45 -4r = 45 Divide each side by '-4'. r = -11.25 Simplifying r = -11.25
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