$\left(5\sqrt{ab}\right)\left(-5\sqrt{a^2b}\right)\left(-3\sqrt{ab^4}\right)$
$\left(7a^2b\right)\left(-3a^2+7b\right)$
$1029-65+12-28$
$6g+5-9g+2$
$b^2,b=2$
$2x+y+2z=6$
$25a-40a+16$
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