Solve for B
B=\frac{A-7C}{4}
Solve for A
A=4B+7C
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4B+7C=A
Swap sides so that all variable terms are on the left hand side.
4B=A-7C
Subtract 7C from both sides.
\frac{4B}{4}=\frac{A-7C}{4}
Divide both sides by 4.
B=\frac{A-7C}{4}
Dividing by 4 undoes the multiplication by 4.
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