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Simplifying 21 = 9 + q Solving 21 = 9 + q Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-1q' to each side of the equation. 21 + -1q = 9 + q + -1q Combine like terms: q + -1q = 0 21 + -1q = 9 + 0 21 + -1q = 9 Add '-21' to each side of the equation. 21 + -21 + -1q = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -1q = 9 + -21 -1q = 9 + -21 Combine like terms: 9 + -21 = -12 -1q = -12 Divide each side by '-1'. q = 12 Simplifying q = 12
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