$\left(x-y+1\right)dx-dy=0$
$\frac{x}{x+y}\ge0.8$
$\frac{-x}{2}+1<\frac{1}{2}$
$7^{12}.7^4$
$-\frac{12}{3}$
$y-6x=7$
$4m+2m+n$
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