下列方程：\(① \dfrac {x}{5}=2\)；\(② \dfrac {5}{x}=2\)；\(③y= \dfrac {2}{3}x\)；\(④ \dfrac {1+x}{5+x}= \dfrac {1}{2}\)；\(⑤y+1= \dfrac {2}{y}\)；\(⑥1+3(x-2)=7-x\)；\(⑦y^{2}-3= \dfrac {y}{3}.\)其中，分式方程有\((\)　　\()\)个．