$14+8-9\cdot6$

$\int\frac{x^2-x+3}{x\left(x^2+1\right)}dx$

$\log\left(x^3\right)+\log\left(x^6\right)-\log\left(\sqrt{x}\right)=25.5$

$\sin\left(\pi-x\right)-\tan\left(\pi+x\right)=\frac{\sin x\left(\cos x-1\right)}{\cos x}$

$-2\left(x-2\right)+5\ge4\left(2x-7\right)-3$

$y-4x=0$

$\frac{2x^2-5x+2}{x^2+x+6}$