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Simplifying 12 = -6r + 2r Combine like terms: -6r + 2r = -4r 12 = -4r Solving 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. 12 + 4r = -4r + 4r Combine like terms: -4r + 4r = 0 12 + 4r = 0 Add '-12' to each side of the equation. 12 + -12 + 4r = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 4r = 0 + -12 4r = 0 + -12 Combine like terms: 0 + -12 = -12 4r = -12 Divide each side by '4'. r = -3 Simplifying r = -3
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