$\frac{2}{x^2-9}-\frac{7x^2}{x-3}+3$
$=\sqrt{2\left(\frac{8}{2}\right)}$
$\int7\left(7x+5\right)^5dx$
$670\:-\:\left(-\:340\right)$
$2,5+-1$
$\frac{5}{2}4.5$
$3x+5\cdot4$
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