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Simplifying 21 + -2q = 3q + -13 Reorder the terms: 21 + -2q = -13 + 3q Solving 21 + -2q = -13 + 3q Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-3q' to each side of the equation. 21 + -2q + -3q = -13 + 3q + -3q Combine like terms: -2q + -3q = -5q 21 + -5q = -13 + 3q + -3q Combine like terms: 3q + -3q = 0 21 + -5q = -13 + 0 21 + -5q = -13 Add '-21' to each side of the equation. 21 + -21 + -5q = -13 + -21 Combine like terms: 21 + -21 = 0 0 + -5q = -13 + -21 -5q = -13 + -21 Combine like terms: -13 + -21 = -34 -5q = -34 Divide each side by '-5'. q = 6.8 Simplifying q = 6.8
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