Solve for a
a=-\left(2b+c\right)
Solve for b
b=\frac{-a-c}{2}
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a+c=-2b
Subtract 2b from both sides. Anything subtracted from zero gives its negation.
a=-2b-c
Subtract c from both sides.
2b+c=-a
Subtract a from both sides. Anything subtracted from zero gives its negation.
2b=-a-c
Subtract c from both sides.
\frac{2b}{2}=\frac{-a-c}{2}
Divide both sides by 2.
b=\frac{-a-c}{2}
Dividing by 2 undoes the multiplication by 2.
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