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Simplifying 3(a + 12) = -9 Reorder the terms: 3(12 + a) = -9 (12 * 3 + a * 3) = -9 (36 + 3a) = -9 Solving 36 + 3a = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 3a = -9 + -36 Combine like terms: 36 + -36 = 0 0 + 3a = -9 + -36 3a = -9 + -36 Combine like terms: -9 + -36 = -45 3a = -45 Divide each side by '3'. a = -15 Simplifying a = -15
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