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Simplifying 4a + 9a + -7a = -42 Combine like terms: 4a + 9a = 13a 13a + -7a = -42 Combine like terms: 13a + -7a = 6a 6a = -42 Solving 6a = -42 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '6'. a = -7 Simplifying a = -7
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