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