$\left(a+7b\right)\left(a+5b\right)$
$\int\frac{8}{\sqrt{x^2+2}}dx$
$5.75-0.072$
$\frac{10a^7b^9}{15a^5b}$
$( 3 x + 8 ) ( 3 x - 10 )$
$\left(+3\right)+\left(-2\right)-\left(+4\right)+\left(-3\right)\left(-5\right)+2$
$x^2+9x+10=0$
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