$75x\:+57=-75x+57$
$\:9w\:-\:7\:-\:2w$
$-0+2\cdot4$
$\frac{4^6}{4^4}$
$\frac{x^3+8}{x+2}$
$sen^2xsec^2x-sec^2x$
$a=\frac{2x^2+4}{x^2-9}$
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