Solve for B
B=\frac{A-5C}{2}
Solve for A
A=2B+5C
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2B=A-5C
Subtract 5C from both sides.
\frac{2B}{2}=\frac{A-5C}{2}
Divide both sides by 2.
B=\frac{A-5C}{2}
Dividing by 2 undoes the multiplication by 2.
A=2B+5C
Swap sides so that all variable terms are on the left hand side.
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