Solve for x
x=\frac{A-3}{12}
Solve for A
A=12x+3
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3+12x=A
Swap sides so that all variable terms are on the left hand side.
12x=A-3
Subtract 3 from both sides.
\frac{12x}{12}=\frac{A-3}{12}
Divide both sides by 12.
x=\frac{A-3}{12}
Dividing by 12 undoes the multiplication by 12.
x=\frac{A}{12}-\frac{1}{4}
Divide A-3 by 12.
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