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Simplifying 9r + 12 + -1(6r + 8) = 0 Reorder the terms: 9r + 12 + -1(8 + 6r) = 0 9r + 12 + (8 * -1 + 6r * -1) = 0 9r + 12 + (-8 + -6r) = 0 Reorder the terms: 12 + -8 + 9r + -6r = 0 Combine like terms: 12 + -8 = 4 4 + 9r + -6r = 0 Combine like terms: 9r + -6r = 3r 4 + 3r = 0 Solving 4 + 3r = 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 + 3r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 3r = 0 + -4 3r = 0 + -4 Combine like terms: 0 + -4 = -4 3r = -4 Divide each side by '3'. r = -1.333333333 Simplifying r = -1.333333333
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