$\left(6a+b\right)\left(2a-b\right)$
$49x^2x-9$
$1,7-0,5$
$\left(25\cdot14\right)^0$
$12-28x+\frac{15}{6x-5}$
$x^2<-9$
$\int\frac{1}{\sqrt{9-4x}}dx$
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