15a^3b^2+5a^2b =5a²b(3a+1)
-20a^2b^2x-45bxy =-5bx(4a²b+9y)
2m(a-b)-3n(b-a) =2m(a-b)+3n(a-b)=(a-b)(2m+3n)
(a-3)^2+(3-a) =(a-3)²-(a-3)=(a-3)(a-3-1)=(a-3)(a-4)
a(x-y)+b(y-x)+c(x-y)=a(x-y)-b(x-y)+c(x-y)=(x-y)(a-b+c)
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