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Simplifying 9 + -1a = -12 Solving 9 + -1a = -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 + -1a = -12 + -9 Combine like terms: 9 + -9 = 0 0 + -1a = -12 + -9 -1a = -12 + -9 Combine like terms: -12 + -9 = -21 -1a = -21 Divide each side by '-1'. a = 21 Simplifying a = 21
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