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Simplifying -21 + -3(2 + -1a) = 0 -21 + (2 * -3 + -1a * -3) = 0 -21 + (-6 + 3a) = 0 Combine like terms: -21 + -6 = -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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