# Factoring trinomial with variables

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

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

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