Solve for b
b=2c-a
Solve for a
a=2c-b
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2c-b=a
Swap sides so that all variable terms are on the left hand side.
-b=a-2c
Subtract 2c from both sides.
\frac{-b}{-1}=\frac{a-2c}{-1}
Divide both sides by -1.
b=\frac{a-2c}{-1}
Dividing by -1 undoes the multiplication by -1.
b=-\left(a-2c\right)
Divide a-2c by -1.
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