$xt'=5x''t$
$\left(xy\right)dy-\left(1+y^2\right)dx=0$
$9x^4+6x^6+3x^8$
$2+5+a$
$2a^3+5a^2-3a^3+2a^2$
$x^2-20x=51$
$y'=\sqrt{1-4x}$
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