$7-x\ge5$
$-12+5x<-x$
$\left(\frac{1}{1+e^{-x}}-2xy\right)dx-x^2dy=0$
$2x''-2x''+1$
$6n+n$
$57-\left(3^2\right)$
$4\left(x+5\right)-2x+34$
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