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Simplifying 9a + -1(3a + -7) = 0 Reorder the terms: 9a + -1(-7 + 3a) = 0 9a + (-7 * -1 + 3a * -1) = 0 9a + (7 + -3a) = 0 Reorder the terms: 7 + 9a + -3a = 0 Combine like terms: 9a + -3a = 6a 7 + 6a = 0 Solving 7 + 6a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 6a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 6a = 0 + -7 6a = 0 + -7 Combine like terms: 0 + -7 = -7 6a = -7 Divide each side by '6'. a = -1.166666667 Simplifying a = -1.166666667
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