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