$-x^2=-3x+18$
$q\left(y\right)=10^7+13^6-16^5+166^4+158^3-239^2-8x+60$
$2\left(x-2\right)^3-\left(x+5\right)^2\:-2x+2;\:x=81$
$xy^'+4y=x^3-x$
$x^2+9x+90$
$\left(x\cdot2y-3z\right)^2$
$\left(5x+2x^2\right)^2$
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