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Simplifying 6a + 9 + -3a = -12 Reorder the terms: 9 + 6a + -3a = -12 Combine like terms: 6a + -3a = 3a 9 + 3a = -12 Solving 9 + 3a = -12 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 + 3a = -12 + -9 Combine like terms: 9 + -9 = 0 0 + 3a = -12 + -9 3a = -12 + -9 Combine like terms: -12 + -9 = -21 3a = -21 Divide each side by '3'. a = -7 Simplifying a = -7
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