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Simplifying -9 + -1(-4 + 12r) = 0 -9 + (-4 * -1 + 12r * -1) = 0 -9 + (4 + -12r) = 0 Combine like terms: -9 + 4 = -5 -5 + -12r = 0 Solving -5 + -12r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -12r = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -12r = 0 + 5 -12r = 0 + 5 Combine like terms: 0 + 5 = 5 -12r = 5 Divide each side by '-12'. r = -0.4166666667 Simplifying r = -0.4166666667
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