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Simplifying 0 = 4a + -9(3 + -1a) 0 = 4a + (3 * -9 + -1a * -9) 0 = 4a + (-27 + 9a) Reorder the terms: 0 = -27 + 4a + 9a Combine like terms: 4a + 9a = 13a 0 = -27 + 13a Solving 0 = -27 + 13a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13a' to each side of the equation. 0 + -13a = -27 + 13a + -13a Remove the zero: -13a = -27 + 13a + -13a Combine like terms: 13a + -13a = 0 -13a = -27 + 0 -13a = -27 Divide each side by '-13'. a = 2.076923077 Simplifying a = 2.076923077
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