$3x^2y-10xy+15x^3$
$5\left(x-3\right)^2+\left(x+3\right)^2$
$x^3y'+5x^2y=x$
$5x^2\:y^3;\:x=3;\:y=2$
$x+4y-8z=-8\:\:\:\:$
$\frac{2x^3-6x^2+x-1}{2x^2+1}$
$\frac{-3x^7}{-9x^4}$
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