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Simplifying 7a + 12 + 9 = 0 Reorder the terms: 12 + 9 + 7a = 0 Combine like terms: 12 + 9 = 21 21 + 7a = 0 Solving 21 + 7a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 7a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7a = 0 + -21 7a = 0 + -21 Combine like terms: 0 + -21 = -21 7a = -21 Divide each side by '7'. a = -3 Simplifying a = -3
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