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Simplifying 3a + 12 + -6a = -9 Reorder the terms: 12 + 3a + -6a = -9 Combine like terms: 3a + -6a = -3a 12 + -3a = -9 Solving 12 + -3a = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -3a = -9 + -12 Combine like terms: 12 + -12 = 0 0 + -3a = -9 + -12 -3a = -9 + -12 Combine like terms: -9 + -12 = -21 -3a = -21 Divide each side by '-3'. a = 7 Simplifying a = 7
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