$20\cdot\:\:2^3\cdot\:\:5^5\cdot\:\:3^2$
$\frac{x^2+2x-2}{x+3}$
$\left(1100-135\right)+\left(680-75\right)+\left(800-12\right)-267$
$8h+-5h-9+-5-4$
$a^2b+a^2c$
$d=\frac{1}{2}\sqrt{4r^2}-c^2$
$3^{\left(x+1\right)}\cdot27^{\left(x+3\right)}=9^{\left(3x+4\right)}$
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