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