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Simplifying 15a + 6a + -2(4a + 5) = 0 Reorder the terms: 15a + 6a + -2(5 + 4a) = 0 15a + 6a + (5 * -2 + 4a * -2) = 0 15a + 6a + (-10 + -8a) = 0 Reorder the terms: -10 + 15a + 6a + -8a = 0 Combine like terms: 15a + 6a = 21a -10 + 21a + -8a = 0 Combine like terms: 21a + -8a = 13a -10 + 13a = 0 Solving -10 + 13a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 13a = 0 + 10 Combine like terms: -10 + 10 = 0 0 + 13a = 0 + 10 13a = 0 + 10 Combine like terms: 0 + 10 = 10 13a = 10 Divide each side by '13'. a = 0.7692307692 Simplifying a = 0.7692307692
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