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Simplifying a + 6a + (-9) = 30 a + 6a + -9 = 30 Reorder the terms: -9 + a + 6a = 30 Combine like terms: a + 6a = 7a -9 + 7a = 30 Solving -9 + 7a = 30 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 = 30 + 9 Combine like terms: -9 + 9 = 0 0 + 7a = 30 + 9 7a = 30 + 9 Combine like terms: 30 + 9 = 39 7a = 39 Divide each side by '7'. a = 5.571428571 Simplifying a = 5.571428571
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