The equation i read as being
Linear differential equation needs to be in the form
So divide through by x+1 to get dy/dx on its own.
The integrating factor is in the form
So integrating factor will be
From this you need to multiply the differential equation in linear form by I(x)
From here I get a little lost myself, I'm learning these also, so I'll leave it here so that maybe someone can clarify the rest.