$\left(2x^2+5x-7\right)+\left(-4x^2+6x+3\right)$
$2a^2\:+\:ab$
$abc+abc^3$
$x^{\frac{2}{5}}+\frac{1}{4x^{\frac{2}{5}}}$
$4x-3\sqrt{2}\ge0$
$4x-2\cdot x+2$
$\lim_{x\to\infty}\left(\frac{-2ln\left(x^5\right)}{-3x^2-13x-8}\right)$
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