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