$\frac{2x+1}{-\frac{1}{2}x}\le\frac{2x-\frac{1}{5}}{x}$
$3ax+3ay+2bx+2by$
$\left(2x+5x\right)\left(7+5x\right)$
$cot2x=0$
$-71-20b-2c$
$\lim_{x\to\infty}\left(\frac{4x-6}{7x^2+5x-5}\right)$
$\left(x^2+4\right)^4-\left(x^2+6x\right)^3$
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