$4x-7x-9x$
$3x^4=2y^3y'$
$5\left(3x^4-18x^3+15x^2-1x+5\right)$
$xy'=y^2+y$
$-8-u=-6$
$-8+41x-5x^2=0$
$\lim_{x\to x}\left(\frac{1}{x-2}-\frac{2}{x^2-2x}\right)$
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