Solve for q
q=\frac{a-3}{7}
Solve for a
a=7q+3
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7q+3=a
Swap sides so that all variable terms are on the left hand side.
7q=a-3
Subtract 3 from both sides.
\frac{7q}{7}=\frac{a-3}{7}
Divide both sides by 7.
q=\frac{a-3}{7}
Dividing by 7 undoes the multiplication by 7.
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