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Simplifying (4a + 16) + -1(a + -4) = x Reorder the terms: (16 + 4a) + -1(a + -4) = x Remove parenthesis around (16 + 4a) 16 + 4a + -1(a + -4) = x Reorder the terms: 16 + 4a + -1(-4 + a) = x 16 + 4a + (-4 * -1 + a * -1) = x 16 + 4a + (4 + -1a) = x Reorder the terms: 16 + 4 + 4a + -1a = x Combine like terms: 16 + 4 = 20 20 + 4a + -1a = x Combine like terms: 4a + -1a = 3a 20 + 3a = x Solving 20 + 3a = x Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 3a = -20 + x Combine like terms: 20 + -20 = 0 0 + 3a = -20 + x 3a = -20 + x Divide each side by '3'. a = -6.666666667 + 0.3333333333x Simplifying a = -6.666666667 + 0.3333333333x
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