$0=x^2+6x+4\:$
$\sqrt{20x^2}-2\sqrt{5x}+6x\sqrt{45}$
$-4m-12$
$\left(x^4+3x^3+6\right)\left(2x-1\right)$
$\int\:\frac{x}{x^2-a^2}dx$
$\frac{2+x}{-1-x}$
$1\:\:0\:\:\:-12\:\:\:\:\:\:\:16\:$
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