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Simplifying 4(3r + -2) + -9 = 91 Reorder the terms: 4(-2 + 3r) + -9 = 91 (-2 * 4 + 3r * 4) + -9 = 91 (-8 + 12r) + -9 = 91 Reorder the terms: -8 + -9 + 12r = 91 Combine like terms: -8 + -9 = -17 -17 + 12r = 91 Solving -17 + 12r = 91 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '17' to each side of the equation. -17 + 17 + 12r = 91 + 17 Combine like terms: -17 + 17 = 0 0 + 12r = 91 + 17 12r = 91 + 17 Combine like terms: 91 + 17 = 108 12r = 108 Divide each side by '12'. r = 9 Simplifying r = 9
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