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Simplifying 3a + -7(a + -8) = -12 Reorder the terms: 3a + -7(-8 + a) = -12 3a + (-8 * -7 + a * -7) = -12 3a + (56 + -7a) = -12 Reorder the terms: 56 + 3a + -7a = -12 Combine like terms: 3a + -7a = -4a 56 + -4a = -12 Solving 56 + -4a = -12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-56' to each side of the equation. 56 + -56 + -4a = -12 + -56 Combine like terms: 56 + -56 = 0 0 + -4a = -12 + -56 -4a = -12 + -56 Combine like terms: -12 + -56 = -68 -4a = -68 Divide each side by '-4'. a = 17 Simplifying a = 17
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