Solve for b
b=a-13
Solve for a
a=b+13
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-b=13-a
Subtract a from both sides.
\frac{-b}{-1}=\frac{13-a}{-1}
Divide both sides by -1.
b=\frac{13-a}{-1}
Dividing by -1 undoes the multiplication by -1.
b=a-13
Divide 13-a by -1.
a=13+b
Add b to both sides.
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