$2r+2+5r-2+r$
$\left(-70\right)-\left(-80\right)$
$\sqrt{100\cdot81}$
$\frac{2x-4}{x-3}<1$
$2a-3b;a=-1,b=-1$
$8\cos^2x+14\cos\left(x\right)-9=0$
$\left(5x^4+x^3-2x^2-5\right)-\:\left(7x^4-5x^2+3x+4\right)$
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