$6b-2a$
$x^2-5x=-3$
$7u+3u$
$6\cdot\left(-1\right)\cdot\left(-2\right)\:\cdot50\cdot\left(-1\right)$
$\frac{x^{12}-y^{12}\:}{x+y}$
$169a^2-7\left(13a\right)-78$
$\left(x^2y+7y^2\right)\left(5x^2y+4x+9y\right)$
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