$\frac{x+2}{x-2}-\frac{x+2}{x+2}$
$36v^2+84vu+49u^2$
$6z+z^2$
$3u+96=180$
$2x+y;\:x=7;\:y=1079$
$4a-3\left(4-a\right)$
$\left(9x^2-2x+4\right)$
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