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3x+2=b
Swap sides so that all variable terms are on the left hand side.
3x=b-2
Subtract 2 from both sides.
\frac{3x}{3}=\frac{b-2}{3}
Divide both sides by 3.
x=\frac{b-2}{3}
Dividing by 3 undoes the multiplication by 3.