$=3yb=-6\:\:$
$3xyz+5xmz-8xz-xnzw$
$\:\left(6x^3-10x-15\right)$
$x^{2}+3x+2>0$
$\left(-a+7b\right)^4$
$\left(7x\:+\:1\right)^3$
$-4-9-2+8+4+3-1$
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