$209^2-45$
$3y-2+2y+7-y$
$( n ^ { 2 } - 1 ) ( n ^ { 2 } + 7 ) ( n ^ { 4 } - 6 x ^ { 2 } - 7 )$
$-56+45y^2-37y$
$9p-3p$
$\frac{12x^2+4x-1}{x+4}.\left(x+4\right)$
$\int\:\frac{x}{\left(\sqrt{x}2+7\right)}dx$
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