$2z'+3z=8$
$\int_2^5\left(x^2+1\right)dx$
$\int xe^{-y}dy$
$\frac{\left(x+y\right)^2-x^2}{\left(x+y\right)-x}$
$4\:-\:15$
$1467+x=1653$
$\frac{tanx+cotx}{2}$
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