$\frac{dq}{dt}+2tq=t$
$\left(x-y\right)dx\:=-\left(x+y\right)dy$
$\frac{2}{x-1}=\frac{x+4}{x+1}$
$25y^2\:-\:121b^2$
$10-6\cdot3\cdot4$
$\frac{d}{dx}7x^5.\arctan x$
$34=k+10$
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