$4\cdot\left(3x+4\right)-6-6x$
$\left(x^4+2y^4\right)^2$
$abc+abc^3$
$a\left(r-s\right)-2b\left(r-s\right)-r+s$
$y^2+9y=0$
$\int_0^1\left(\frac{1}{1+18x^2}\right)dx$
$\frac{d^3}{dx^3}\left(3-2x^2\right)^6$
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