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Simplifying 15a + -1(12a + -1(3a + 5)) = 0 Reorder the terms: 15a + -1(12a + -1(5 + 3a)) = 0 15a + -1(12a + (5 * -1 + 3a * -1)) = 0 15a + -1(12a + (-5 + -3a)) = 0 Reorder the terms: 15a + -1(-5 + 12a + -3a) = 0 Combine like terms: 12a + -3a = 9a 15a + -1(-5 + 9a) = 0 15a + (-5 * -1 + 9a * -1) = 0 15a + (5 + -9a) = 0 Reorder the terms: 5 + 15a + -9a = 0 Combine like terms: 15a + -9a = 6a 5 + 6a = 0 Solving 5 + 6a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 6a = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 6a = 0 + -5 6a = 0 + -5 Combine like terms: 0 + -5 = -5 6a = -5 Divide each side by '6'. a = -0.8333333333 Simplifying a = -0.8333333333
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