$-8n-4+n+7$
$3x^2-7x+5-4+3x-x^2$
$\frac{1000x^3-8y}{6x-8y^3}$
$\frac{8}{y+6}-\frac{5}{y+6}$
$\left(c^2-5\right)^2$
$\lim_{x\to1}\left(1-x\right)^{log\:x}$
$1-\tan^2a$
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