$-\frac{5a^2+8ab-21b^2}{a+3b}$
$14\cdot2+8\cdot2$
$3\cdot10^{7}$
$a-11=4$
$12x^2-4<27x-23$
$\sec^2\left(3x\right)+2\tan\left(3x\right)-1=4$
$\frac{dx}{dt}=\left(1-x\right)sin\left(t\right)$
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