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Simplifying -12 = -3r + 7r Combine like terms: -3r + 7r = 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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