3x^2/5ay1-(x+2y)/(x+y)=-y/(x+y)[(x+2)/x(x-2)-(x-1)/(x-2)^2][x/(x-4)]=[(x+2)(x-2)-x(x-1)][x/(x-4)]/x(x-2)^2=[x^2-4-x^2+x][x/(x-4)]/x(x-2)^2=1/(x-2)^2
