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Simplifying 4a + 2 + -1(a + -7) = 0 Reorder the terms: 4a + 2 + -1(-7 + a) = 0 4a + 2 + (-7 * -1 + a * -1) = 0 4a + 2 + (7 + -1a) = 0 Reorder the terms: 2 + 7 + 4a + -1a = 0 Combine like terms: 2 + 7 = 9 9 + 4a + -1a = 0 Combine like terms: 4a + -1a = 3a 9 + 3a = 0 Solving 9 + 3a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 3a = 0 + -9 3a = 0 + -9 Combine like terms: 0 + -9 = -9 3a = -9 Divide each side by '3'. a = -3 Simplifying a = -3
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