Solve for a
a=\frac{b}{2}
Solve for b
b=2a
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2a=b
The equation is in standard form.
\frac{2a}{2}=\frac{b}{2}
Divide both sides by 2.
a=\frac{b}{2}
Dividing by 2 undoes the multiplication by 2.
b=2a
Swap sides so that all variable terms are on the left hand side.
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