$y'-7y=14x$
$15x-x-45x$
$\frac{m^{18}-8000}{m^6-20}$
$149\le26s+45$
$\frac{\frac{1}{-0}}{\frac{8}{8}}$
$-48xy+35-13xy+62x^2+28-55x^2$
$a^2+7a+12=0$
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