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Simplifying 12r + -8r + -12 = 0 Reorder the terms: -12 + 12r + -8r = 0 Combine like terms: 12r + -8r = 4r -12 + 4r = 0 Solving -12 + 4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. 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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