$\int\frac{7x+3}{\left(x-2\right)\left(x-9\right)}dx$
$5x-2<7x+1$
$\left(1+\tan\left(x\right)\right)\left(5\sin\left(x\right)-2\right)$
$b-6=-3$
$3x=5\left(8-x\right)$
$a^2\left(\int\sec^3\left(z\right)\right)dz$
$y=\frac{1}{2}\left(x^2-1\right)arctghx+\frac{1}{2}x$
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