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Simplifying -4 = -2(6 + -1a) -4 = (6 * -2 + -1a * -2) -4 = (-12 + 2a) Solving -4 = -12 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. -4 + -2a = -12 + 2a + -2a Combine like terms: 2a + -2a = 0 -4 + -2a = -12 + 0 -4 + -2a = -12 Add '4' to each side of the equation. -4 + 4 + -2a = -12 + 4 Combine like terms: -4 + 4 = 0 0 + -2a = -12 + 4 -2a = -12 + 4 Combine like terms: -12 + 4 = -8 -2a = -8 Divide each side by '-2'. a = 4 Simplifying a = 4
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