$6z,\:3w^2,\:1,\:6z^2,4z,w^2$
$-8x-4x+2x-3x$
$1-0.38$
$\left(f^4-2\right)\left(f^4+5\right)$
$18x-x^2+4$
$\left(e^x\right)^2+5$
$\frac{y+2}{y-3}+\frac{y-2}{3-y}$
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