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Simplifying 7a + -1(3a + -4) = 12 Reorder the terms: 7a + -1(-4 + 3a) = 12 7a + (-4 * -1 + 3a * -1) = 12 7a + (4 + -3a) = 12 Reorder the terms: 4 + 7a + -3a = 12 Combine like terms: 7a + -3a = 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 = 8 4a = 8 Divide each side by '4'. a = 2 Simplifying a = 2
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