Add \(8\) to both sides.
\[3x=x+4+8\]
Simplify \(x+4+8\) to \(x+12\).
\[3x=x+12\]
Subtract \(x\) from both sides.
\[3x-x=12\]
Simplify \(3x-x\) to \(2x\).
\[2x=12\]
Divide both sides by \(2\).
\[x=\frac{12}{2}\]
Simplify \(\frac{12}{2}\) to \(6\).
\[x=6\]
x=6
