Factoring trinomial with variables

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$$7y^{2a+b}-5y^{a+b}+3y^{a+2b}$$

I don't really kow how to start...I guess a $y$ could be factored out but that's completely useless.

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$$ 7y^{2a+b}-5y^{a+b}+3y^{a+2b}=y^{a+b}(7y^a-5+3y^b) $$