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Simplifying 3a + 9 + 4a = 15 Reorder the terms: 9 + 3a + 4a = 15 Combine like terms: 3a + 4a = 7a 9 + 7a = 15 Solving 9 + 7a = 15 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 + 7a = 15 + -9 Combine like terms: 9 + -9 = 0 0 + 7a = 15 + -9 7a = 15 + -9 Combine like terms: 15 + -9 = 6 7a = 6 Divide each side by '7'. a = 0.8571428571 Simplifying a = 0.8571428571
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