$7z+8+3z$
$2^2-3^{-4}$
$\frac{4}{7}x+\frac{5}{14}x=39$
$20+90+51mnuv$
$2y^2-4y+4$
$\frac{1}{2}x\frac{3}{4}$
$\int\frac{5x}{\left(x^2+1\right)^2}\:dx$
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