$400+120xyz+9$
$\left(2x+y-z\right)\left(2x+y+z\right)$
$x^3-2x+5x+6$
$\left(-12\right):-4$
$2x^2+4y=5$
$\left(2x+1\right)\left(4x^2\right)\left(x-9\right)^{\left(\frac{1}{2}\right)}$
$\:\frac{160\pi}{180}$
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