Solve for A
A=\frac{C-B}{7}
Solve for B
B=C-7A
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7A=C-B
Subtract B from both sides.
\frac{7A}{7}=\frac{C-B}{7}
Divide both sides by 7.
A=\frac{C-B}{7}
Dividing by 7 undoes the multiplication by 7.
B=C-7A
Subtract 7A from both sides.
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