$xy-2x$
$\left|-25\right|+\left|-45\right|$
$\int_0^2x^3\sqrt{x^2+4}dx$
$\left(x^{2n}+y^{2n}\right)\left(x^{2n}-y^{2n}\right)$
$\left(3^2\right)^2\cdot3^2$
$\left(a+2\right)\left(2a+1\right)$
$12x<6x+12\:$
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