$3x^2+3x+6=2x^2+x+2$
$x-20=50$
$348\cdot1.4-18\cdot1.4$
$3x^2-30x$
$\lim\:_{x\to\:+\infty\:\:}\left(\frac{2x+a}{2x+b}\right)^x$
$\int_{\frac{\pi}{4}}^{\frac{\pi}{3}}\cos\left(x\right)^4dx$
$27x^{2}\cdot\sqrt{3x^{4}}$
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