I should really know the answer to this but am having trouble seeing it

I have a first order differential

$\displaystyle x\frac{dy}{dx} +\frac{y}{1-x} = (x-1)^2 sinx$

I get the intergrating factor $\displaystyle \frac{x}{1-x}$

but when multiplied through to get:

$\displaystyle \frac{x}{1-x}\frac{dy}{dx} + \frac{1}{(1-x)^2} y = (1-x) sinx$

i do not see the what the left side intergral should be any help would be greatly appreciated