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Simplifying -10r + -1(12r + 9) = 0 Reorder the terms: -10r + -1(9 + 12r) = 0 -10r + (9 * -1 + 12r * -1) = 0 -10r + (-9 + -12r) = 0 Reorder the terms: -9 + -10r + -12r = 0 Combine like terms: -10r + -12r = -22r -9 + -22r = 0 Solving -9 + -22r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -22r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -22r = 0 + 9 -22r = 0 + 9 Combine like terms: 0 + 9 = 9 -22r = 9 Divide each side by '-22'. r = -0.4090909091 Simplifying r = -0.4090909091
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