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Simplifying -21 = q + -20 Reorder the terms: -21 = -20 + q Solving -21 = -20 + 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 = -20 + q + -1q Combine like terms: q + -1q = 0 -21 + -1q = -20 + 0 -21 + -1q = -20 Add '21' to each side of the equation. -21 + 21 + -1q = -20 + 21 Combine like terms: -21 + 21 = 0 0 + -1q = -20 + 21 -1q = -20 + 21 Combine like terms: -20 + 21 = 1 -1q = 1 Divide each side by '-1'. q = -1 Simplifying q = -1
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