$x-5\le3+2x$
$\frac{2x^2-2x+1}{x^3+x}$
$27a^3-8b^3$
$3cos^2x+cosx-2$
$\left(-3\cdot7\right)+\frac{10}{5}-\left(18-7\right)$
$b2-6b+4=0$
$\left(x^2+y^2-4x+3y-6\right)-\left(-4x+6y^2+2x^2-y-5\right)$
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