$-8+5x=4x+8$
$-4r-7r+2r-r$
$\frac{2^2+2z-3}{z+3}$
$\frac{\left(sec^2\theta\:\right)}{\left(csc^2\theta\:\right)}$
$\left(3-2x-x^2\right)^2$
$m^2+10m+30=10$
$\lim_{x\to0}\frac{\sqrt{x+3}-\sqrt{3}}{x}$
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