$\frac{21ab^2}{3ab^2}$
$\left(3a+2\right)\left(a+1\right)$
$100\sin\left(x+y\right)t-100\sin\left(x+y\right)t$
$-2.7-0.7+4.2$
$a-14a$
$tanx\left(secx-1\right)\left(secx+1\right)$
$y'-2y=e^{2x}$
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