$2x\:-\:3y+7z\:-5x\:-2y+z$
$\left(3d+7l\right)\left(2x-3y\right)$
$\int\frac{4}{\sqrt[3]{2x+1}}dx$
$\sqrt{3}\sec x-2=0$
$0,42+0,040+0,75+0,073$
$-r+7-8r-16$
$\int\frac{x^2}{\sqrt[4]{2x^3-1}}dx$
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