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Simplifying 4a + -9(3 + -1a) = 0 4a + (3 * -9 + -1a * -9) = 0 4a + (-27 + 9a) = 0 Reorder the terms: -27 + 4a + 9a = 0 Combine like terms: 4a + 9a = 13a -27 + 13a = 0 Solving -27 + 13a = 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 + 13a = 0 + 27 Combine like terms: -27 + 27 = 0 0 + 13a = 0 + 27 13a = 0 + 27 Combine like terms: 0 + 27 = 27 13a = 27 Divide each side by '13'. a = 2.076923077 Simplifying a = 2.076923077
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