$13\cdot2\cdot\left(-6\right)$
$7z+15+27z+15+27,\:z,\:plus,\:15,plus,\:2$
$7v\cdot3v^2\cdot6v^2$
$\cos\left(x+m\right)$
$\frac{x^2+8x+15}{x+5}$
$\left|-26\right|-\left|-17\right|$
$r^2+2r-7=0$
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