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Simplifying 12a + 12 + -5a + -9 = 0 Reorder the terms: 12 + -9 + 12a + -5a = 0 Combine like terms: 12 + -9 = 3 3 + 12a + -5a = 0 Combine like terms: 12a + -5a = 7a 3 + 7a = 0 Solving 3 + 7a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 7a = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 7a = 0 + -3 7a = 0 + -3 Combine like terms: 0 + -3 = -3 7a = -3 Divide each side by '7'. a = -0.4285714286 Simplifying a = -0.4285714286
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