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Simplifying 12a + 3 + 18 + -9a = 0 Reorder the terms: 3 + 18 + 12a + -9a = 0 Combine like terms: 3 + 18 = 21 21 + 12a + -9a = 0 Combine like terms: 12a + -9a = 3a 21 + 3a = 0 Solving 21 + 3a = 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 + 3a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3a = 0 + -21 3a = 0 + -21 Combine like terms: 0 + -21 = -21 3a = -21 Divide each side by '3'. a = -7 Simplifying a = -7
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