$\left(a^2-3ab-7b\right)\left(b-a\right)$
$\frac{6}{2x}$
$100+5x+x^2$
$3t-153\le-159$
$\left(2a+3b+5\right)^2$
$\left(6c^2b^2-7\right)\left(3c^2b^2+3\right)$
$du=2dy$
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