$90\cdot40$
$\int\frac{3}{\sqrt{3}}dx$
$-21x^4+9x^4$
$\frac{b}{11}-\frac{6b}{11}=\frac{20}{11}$
$\left(1-x^2\right)y'+xy=2x$
$\tan^{-1}\left(3x\right)=3$
$-12x+14y+8x-12y$
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