$- 9 \cdot ( - 2 : 18 )$
$14r+11>-227$
$x2\:+\:7x\:=\:144\:+\:7x$
$3x^2-8x+16$
$\frac{3}{4}x+2<\frac{1}{3}$
$\int\frac{e^{4x}}{x^2}dx$
$\int-x.\log\left(\frac{c}{x}\right)dx$
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