The expression $a-5b$ cannot be factored further. The expression $a^{2}+ab$ can be factored as $a(a+b)$. The expression $b^{2}-a^{2}$ is a difference of squares and can be factored as $(b-a)(b+a)$. The expression $10b-2a$ can be factored as $2(5b-a)$.
So, the
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