$27\:-\:5s\:=\:7s\:-\:21$
$x'=bx$
$\frac{dx}{dy}=2xe^{-y}$
$\int x^3\cdot e^{6x^4+1}dx$
$-\sqrt{13}+\sqrt{13}$
$\left(3n^2-a\right)\left(a+3n^2\right)$
$y=\left(5x^2-3x^4\right)^7$
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