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Simplifying 9 + a = -21 Solving 9 + a = -21 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 + a = -21 + -9 Combine like terms: 9 + -9 = 0 0 + a = -21 + -9 a = -21 + -9 Combine like terms: -21 + -9 = -30 a = -30 Simplifying a = -30
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