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Simplifying 3r + 6(2 + 2r) = -108 3r + (2 * 6 + 2r * 6) = -108 3r + (12 + 12r) = -108 Reorder the terms: 12 + 3r + 12r = -108 Combine like terms: 3r + 12r = 15r 12 + 15r = -108 Solving 12 + 15r = -108 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 15r = -108 + -12 Combine like terms: 12 + -12 = 0 0 + 15r = -108 + -12 15r = -108 + -12 Combine like terms: -108 + -12 = -120 15r = -120 Divide each side by '15'. r = -8 Simplifying r = -8
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