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Simplifying 13 + 3(4r + -3) = -8 Reorder the terms: 13 + 3(-3 + 4r) = -8 13 + (-3 * 3 + 4r * 3) = -8 13 + (-9 + 12r) = -8 Combine like terms: 13 + -9 = 4 4 + 12r = -8 Solving 4 + 12r = -8 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 = -8 + -4 Combine like terms: 4 + -4 = 0 0 + 12r = -8 + -4 12r = -8 + -4 Combine like terms: -8 + -4 = -12 12r = -12 Divide each side by '12'. r = -1 Simplifying r = -1
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