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Simplifying 0 = 4a + 16 + -1(a + -4) Reorder the terms: 0 = 4a + 16 + -1(-4 + a) 0 = 4a + 16 + (-4 * -1 + a * -1) 0 = 4a + 16 + (4 + -1a) Reorder the terms: 0 = 16 + 4 + 4a + -1a Combine like terms: 16 + 4 = 20 0 = 20 + 4a + -1a Combine like terms: 4a + -1a = 3a 0 = 20 + 3a Solving 0 = 20 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 0 + -3a = 20 + 3a + -3a Remove the zero: -3a = 20 + 3a + -3a Combine like terms: 3a + -3a = 0 -3a = 20 + 0 -3a = 20 Divide each side by '-3'. a = -6.666666667 Simplifying a = -6.666666667
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