$^{10}a-2a+1$
$\left(xy-2\right)^4$
$-\left(2+7-3\right)\:-2$
$3xy-6x+9y-18$
$\left(x+3\right)\left(x-12\right)\le0$
$\left(x^2+y\right)dx+\left(x-2\right)dy=0$
$y^2-4y=4y+16$
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