$\frac{7-x}{\left(x-2\right)\left(x+2\right)}=0$
$\int\frac{8x}{\sqrt{-x^2-4x}}dx$
$x^3+5x^2-17x-21$
$\int z^3\left(9+z^2\right)^{\frac{1}{3}}dz$
$\frac{dg}{dy}=3y^2+2y$
$\sqrt{4a^2}b$
$\int_0^1\left(e\left(2-x\right)\right)dx$
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