Solve for b
b=-\frac{c}{2}
Solve for c
c=-2b
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4+2b+c=4
Swap sides so that all variable terms are on the left hand side.
2b+c=4-4
Subtract 4 from both sides.
2b+c=0
Subtract 4 from 4 to get 0.
2b=-c
Subtract c from both sides. Anything subtracted from zero gives its negation.
\frac{2b}{2}=-\frac{c}{2}
Divide both sides by 2.
b=-\frac{c}{2}
Dividing by 2 undoes the multiplication by 2.
4+2b+c=4
Swap sides so that all variable terms are on the left hand side.
2b+c=4-4
Subtract 4 from both sides.
2b+c=0
Subtract 4 from 4 to get 0.
c=-2b
Subtract 2b from both sides. Anything subtracted from zero gives its negation.
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