$\left(3-1\right)\cdot\left(2^2-2\right)^2$
$x^2-14x-51$
$\left(x^{3n}-y^{5n-1}\right)^2$
$12\left(10\right)\left(5\right)$
$-y^2\sqrt{2}y$
$x+4+\frac{2}{x+1}$
$2\:\left(x+3\right)-x$
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