$12+5\left(3-2\cdot2\right)-7$
$\left(6abc^3\right)\left(ab^2c\right)$
$\left(4x\right)\left(-y\right)^2$
$5^{9-\left(0\right)^2}$
$-2xy+4xz$
$\lim_{x\to0}\left(\frac{\tan\left(4x\right)}{\tan\left(7x\right)}\right)$
$a^6b^8-36$
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