$2x^2+y^2-5x^2+8y^2+3x^3$
$\left(2m-n^2\right)^2$
$1+x^2-3+2y+7x^2+3+3y$
$25z^2+80z+64$
$x\int\left(x^{-1}e^x\right)dx$
$5x^3y^2+7xy^2-3x^2y^3$
$36x^3yz-72x^2z^2+54x^2yz^3$
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