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Simplifying q + 21 = 8q Reorder the terms: 21 + q = 8q Solving 21 + q = 8q Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-8q' to each side of the equation. 21 + q + -8q = 8q + -8q Combine like terms: q + -8q = -7q 21 + -7q = 8q + -8q Combine like terms: 8q + -8q = 0 21 + -7q = 0 Add '-21' to each side of the equation. 21 + -21 + -7q = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7q = 0 + -21 -7q = 0 + -21 Combine like terms: 0 + -21 = -21 -7q = -21 Divide each side by '-7'. q = 3 Simplifying q = 3
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