$2w+2x+2y+2z$
$\frac{1}{2}a+\frac{1}{2}$
$\int\frac{z}{2z^2+8}dz$
$\frac{x}{\cos\left(x\right)}=y$
$18x^2y^2z+9xy^2z^2$
$-3\cos\left(x\right)=-11\cos\left(x\right)-4$
$\left(ax+b\right)\left(a^2x^2-axb+b^2\right)$
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