$5x^3+xy^2=5x^3z^3$
$-16\cdot21$
$\frac{xdx}{dy}=\left(x^2+1\right)\:y\sqrt{1+y^2}$
$2x+3y+2=1970$
$\left(4y^4+2z^3\right)^2$
$i'=\frac{1+2t}{2i}$
$36x^2-y^2-78x-13y$
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