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