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