\(\Leftrightarrow\frac{x+7}{3}+\frac{x+5}{4}-\frac{x+3}{5}-\frac{x+1}{6}=0\)
MSC=60
\(\Leftrightarrow\frac{20x+140}{60}+\frac{15x+75}{60}-\frac{20x+60}{60}-\frac{10x+10}{60}=0\)
\(\Leftrightarrow\frac{13x+169}{60}=0\)
⇒13x+169=0
⇒13(x+13)=0
⇒x+13=0⇒x=-13
Vậy: x=-13