$\left(\frac{2}{5}ab-\frac{3}{4}a^{2n+1}\right)^2$
$-2x-2>-x^{\left(2\right)}+6x+7$
$\left(x+3x\right)\left(a+b\right)$
$\frac{m}{m}+\frac{2}{2}$
$k^m\cdot k^n$
$\frac{4x^3-7x^2-21x+9}{4x-3}$
$g^{12}-400$
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