$4m^2-48+144$
$\left(y^2-2\cdot x\cdot y+x^2\right)\cdot dx+2x^2\cdot dy=0$
$3ax^2+6ax+3a$
$\frac{x^3-2x^2+x+1}{x^3-2x^2+x}$
$-2x^2+6x+3$
$-4\cdot240$
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