$\frac{m^{12}-n^{12}}{m^2+n^2}$
$x+20=-20$
$\frac{7}{\left(x+1\right)\left(x-6\right)}$
$\left(4-2t\right)^2$
$\left(9x-8x^2\right)^3$
$-0.75x^3+0x^2+9x-15$
$2x^2+12x+18$
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