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