$\left(8x+z\right)^3$
$7\cos b-\sqrt{13}=0$
$u^2-u-u^2$
$x^2-2,2x$
$-x^3+4x^2+11-30$
$4c+8-3c+1$
$\left(n+2m^2\right)^2\cdot\left(n-2m^2\right)^2$
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