$x^2\:-10x\:+5\:=0$
$x^6+4^4$
$-6-3x$
$\lim_{x\to0}\left(\frac{\left(1+x\right)\left(1+2x\right)\left(1+3x\right)-6}{x}\right)$
$\frac{3x^2+2xy}{9x^2-4y^2}$
$3\sin^2x-7\sin x-6$
$x^2+xy+yx+y^2$
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