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Simplifying 2a + -1(-2a + -4) = -12 Reorder the terms: 2a + -1(-4 + -2a) = -12 2a + (-4 * -1 + -2a * -1) = -12 2a + (4 + 2a) = -12 Reorder the terms: 4 + 2a + 2a = -12 Combine like terms: 2a + 2a = 4a 4 + 4a = -12 Solving 4 + 4a = -12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 4a = -12 + -4 Combine like terms: 4 + -4 = 0 0 + 4a = -12 + -4 4a = -12 + -4 Combine like terms: -12 + -4 = -16 4a = -16 Divide each side by '4'. a = -4 Simplifying a = -4
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