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Simplifying 7a + -1(3a + -8) = 12 Reorder the terms: 7a + -1(-8 + 3a) = 12 7a + (-8 * -1 + 3a * -1) = 12 7a + (8 + -3a) = 12 Reorder the terms: 8 + 7a + -3a = 12 Combine like terms: 7a + -3a = 4a 8 + 4a = 12 Solving 8 + 4a = 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 + 4a = 12 + -8 Combine like terms: 8 + -8 = 0 0 + 4a = 12 + -8 4a = 12 + -8 Combine like terms: 12 + -8 = 4 4a = 4 Divide each side by '4'. a = 1 Simplifying a = 1
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