$1+7-12+6-13+4-11$
$9c^2-39c+40$
$8-4\cdot4$
$4x+16x^2=0$
$\lim_{x\to6}\left(2x^3+4x^2+5\right)$
$x^2y^2-\:y^2=x^2$
$2yx^2\cdot8x^3$
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