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Simplifying 12r + -1(-4) = 0 Multiply -1 * -4 12r + 4 = 0 Reorder the terms: 4 + 12r = 0 Solving 4 + 12r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 12r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 12r = 0 + -4 12r = 0 + -4 Combine like terms: 0 + -4 = -4 12r = -4 Divide each side by '12'. r = -0.3333333333 Simplifying r = -0.3333333333
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