The first expression, $3a-3b$, can be factorized by taking out a common factor of 3, which gives us $3(a-b)$.
The second expression, $a^{2}+ab-2b^{2}$, can be factorized into $(a-b)(a+2b)$.
The third expression, $(a-b)^{2}$, is already in its factorized form.
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