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下列方程：\(①\dfrac{x}{5}=2\)；\(②\dfrac{5}{x}=2\)；\(③y=\dfrac{2}{3}x\)；\(④\dfrac{1+x}{5+x}=\dfrac{1}{2}\)；\(⑤y+1=\dfrac{2}{y}\)；\(⑥{{y}^{2}}-3=\dfrac{y}{3}\)；\(⑦\)\(1+3(x-2)=7-x\)\(.\)其中分式方程有\((\) \()\)个．
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