$\int\frac{\left(4-x\right)^3}{x}dx$
$a^2+20-21a$
$3x^2-2x\quad$
$\int\sin^8\left(x\right)\cos^2xdx$
$\lim_{x\to1}\left(\arctanh\left(x\right)\right)^{\ln\left(x\right)}$
$\frac{dy}{dx}\left(3+e^x\right)=e^{x-y}$
$5x-2y-3z+6y-7x+7z+3x-2z-5y$
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