Solve for q
q = \frac{90}{7} = 12\frac{6}{7} \approx 12.857142857
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21q=231+39
Add 39 to both sides.
21q=270
Add 231 and 39 to get 270.
q=\frac{270}{21}
Divide both sides by 21.
q=\frac{90}{7}
Reduce the fraction \frac{270}{21} to lowest terms by extracting and canceling out 3.
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