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Simplifying -12a + 4(-19 + 4a) = -56 -12a + (-19 * 4 + 4a * 4) = -56 -12a + (-76 + 16a) = -56 Reorder the terms: -76 + -12a + 16a = -56 Combine like terms: -12a + 16a = 4a -76 + 4a = -56 Solving -76 + 4a = -56 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '76' to each side of the equation. -76 + 76 + 4a = -56 + 76 Combine like terms: -76 + 76 = 0 0 + 4a = -56 + 76 4a = -56 + 76 Combine like terms: -56 + 76 = 20 4a = 20 Divide each side by '4'. a = 5 Simplifying a = 5
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