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Simplifying 84 = -4(3a + -4) Reorder the terms: 84 = -4(-4 + 3a) 84 = (-4 * -4 + 3a * -4) 84 = (16 + -12a) Solving 84 = 16 + -12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12a' to each side of the equation. 84 + 12a = 16 + -12a + 12a Combine like terms: -12a + 12a = 0 84 + 12a = 16 + 0 84 + 12a = 16 Add '-84' to each side of the equation. 84 + -84 + 12a = 16 + -84 Combine like terms: 84 + -84 = 0 0 + 12a = 16 + -84 12a = 16 + -84 Combine like terms: 16 + -84 = -68 12a = -68 Divide each side by '12'. a = -5.666666667 Simplifying a = -5.666666667
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