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Simplifying -3(a + -4) = -9 Reorder the terms: -3(-4 + a) = -9 (-4 * -3 + a * -3) = -9 (12 + -3a) = -9 Solving 12 + -3a = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -3a = -9 + -12 Combine like terms: 12 + -12 = 0 0 + -3a = -9 + -12 -3a = -9 + -12 Combine like terms: -9 + -12 = -21 -3a = -21 Divide each side by '-3'. a = 7 Simplifying a = 7
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