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Simplifying -12r + -8 + -12 = 0 Reorder the terms: -8 + -12 + -12r = 0 Combine like terms: -8 + -12 = -20 -20 + -12r = 0 Solving -20 + -12r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -12r = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -12r = 0 + 20 -12r = 0 + 20 Combine like terms: 0 + 20 = 20 -12r = 20 Divide each side by '-12'. r = -1.666666667 Simplifying r = -1.666666667
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