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Simplifying -12 = 4 + -4r Solving -12 = 4 + -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. -12 + 4r = 4 + -4r + 4r Combine like terms: -4r + 4r = 0 -12 + 4r = 4 + 0 -12 + 4r = 4 Add '12' to each side of the equation. -12 + 12 + 4r = 4 + 12 Combine like terms: -12 + 12 = 0 0 + 4r = 4 + 12 4r = 4 + 12 Combine like terms: 4 + 12 = 16 4r = 16 Divide each side by '4'. r = 4 Simplifying r = 4
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