Multiply both sides by \(3\).
\[1.2(x+6)=x+3\]
Expand.
\[1.2x+7.2=x+3\]
Subtract \(x\) from both sides.
\[1.2x+7.2-x=3\]
Simplify \(1.2x+7.2-x\) to \(0.2x+7.2\).
\[0.2x+7.2=3\]
Subtract \(7.2\) from both sides.
\[0.2x=3-7.2\]
Simplify \(3-7.2\) to \(-4.2\).
\[0.2x=-4.2\]
Divide both sides by \(0.2\).
\[x=-\frac{4.2}{0.2}\]
Simplify \(\frac{4.2}{0.2}\) to \(21\).
\[x=-21\]
x=-21
