$3m-2n-2nx^2+3mx^2$
$n^3+\:3n^2\:+3n\:+\:1$
$420\cdot2+526+120\cdot3$
$\frac{d^2u}{dt^2}+\frac{du}{dt}=6u+5e^{2t}$
$\frac{\sin\left(m\right)+\cos\left(m\right)}{1+\cot\left(m\right)}=\sin\left(m\right)$
$\csc^2\left(u\right)-4=0$
$-17\cdot x=-51$
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