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Simplifying -5a + 4(2 + -1a) = -12 -5a + (2 * 4 + -1a * 4) = -12 -5a + (8 + -4a) = -12 Reorder the terms: 8 + -5a + -4a = -12 Combine like terms: -5a + -4a = -9a 8 + -9a = -12 Solving 8 + -9a = -12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -9a = -12 + -8 Combine like terms: 8 + -8 = 0 0 + -9a = -12 + -8 -9a = -12 + -8 Combine like terms: -12 + -8 = -20 -9a = -20 Divide each side by '-9'. a = 2.222222222 Simplifying a = 2.222222222
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