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Simplifying -12 + -3(5 + -1a) = 0 -12 + (5 * -3 + -1a * -3) = 0 -12 + (-15 + 3a) = 0 Combine like terms: -12 + -15 = -27 -27 + 3a = 0 Solving -27 + 3a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '27' to each side of the equation. -27 + 27 + 3a = 0 + 27 Combine like terms: -27 + 27 = 0 0 + 3a = 0 + 27 3a = 0 + 27 Combine like terms: 0 + 27 = 27 3a = 27 Divide each side by '3'. a = 9 Simplifying a = 9
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