$6x^2=x+222$
$6x-4y+4z=28$
$16y^2+24y+9$
$\lim_{x\to-4}\left(\frac{x^2+8x+16}{x^2-16}\right)$
$-2\left(5\cdot3\right)+\left(6\cdot5\right)$
$2x\:+\:4\:=\:5x\:-\:11$
$\frac{4x^2+14x+10}{x+2}$
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