$64t^2-144$
$3f^2-2f=1$
$y'+2xy=2x$
$\frac{2x-6a}{ax-2y}\cdot\frac{2x+4y}{bx-3bx}$
$2x\:+8\:=\:x\:+\:15$
$12mx-18nx-16my+24ny$
$-23,104-74,263$
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