Solve for C
C=3a-4b
Solve for a
a=\frac{C+4b}{3}
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C=3a+3b-7b
Combine -2a and 5a to get 3a.
C=3a-4b
Combine 3b and -7b to get -4b.
C=3a+3b-7b
Combine -2a and 5a to get 3a.
C=3a-4b
Combine 3b and -7b to get -4b.
3a-4b=C
Swap sides so that all variable terms are on the left hand side.
3a=C+4b
Add 4b to both sides.
\frac{3a}{3}=\frac{C+4b}{3}
Divide both sides by 3.
a=\frac{C+4b}{3}
Dividing by 3 undoes the multiplication by 3.
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