$\lim_{x\to0}\left(\frac{7x+x^2}{x}\right)$
$y^2+10y+26$
$3^4+4^3$
$x+3xy+4=0$
$3x-36=9x$
$\left(2xy-6\right)^2$
$\left(3x^3-x+12\:\right)+\left(x^2-5x+8\right)$
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