$\left(a-1\right)\left(a-2\right)$
$8a^2-16a-90$
$( + 6 ) \in ( - 3 )$
$\frac{5}{7}x^3-\frac{3}{6}x^3$
$\left(n^2+2n+1\right)^2$
$\left(+8\right)\cdot m=72$
$4x^2+36x^4-6x^3$
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