$15x^3-\frac{20}{7}x^2$

$-x^2-3x+40<0$

$\int x^2\cdot arctan\left(4x\right)dx$

$_{\left(2-x\right)-3\left(6+8x\right)-12}$

$\ln\left(11\right)+\ln\left(x^2+\frac{10x}{11}\right)=0$

$10-7x<4+2x$

$\left\{\sqrt{27\left[\left(\sqrt{12}-\sqrt{3}\right)\left(\sqrt{45-\sqrt{20}}\right)\right]-\sqrt{80}}\right\}$