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Simplifying -3(a + -9) = 0 Reorder the terms: -3(-9 + a) = 0 (-9 * -3 + a * -3) = 0 (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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