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