$\left(x+y-3\right)dx+\left(x-y-1\right)dy=0$
$7x^2y+4xy^2+9+8xy^2-5x^2y-2$
$\left(2\left(a+b\right)-3\right)\left(3\left(a+b\right)+2\right)$
$f\left(x\right)=\frac{x}{5x}$
$\frac{3x-1}{2}\geq0$
$4x^2b^4+4a^2b^5+a^2b^6$
$\left(x-2\right)^2+x\left(x-3\right)$
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