$\frac{x-1}{x}\le4$
$\frac{a+b}{b}$
$\frac{\sqrt{2\left(4+h\right)+1}-3}{h}$
$x+xy+y=1$
$\int\left(\frac{e^{x^2}}{3}\right)dx$
$x^2+26x+168$
$4y+3x-5y+x$
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