Tolong pake cara! Tentukan hasil penyederhanaan dari : ((1:x+y)-(2:x-y)) : ((3:x-y)+(4:x+y))

→[(1/x+y)- (2/x-y)] : [(3/x-y) + (4/x+y)]
→[(x-y)-2 (x+y) / (x+y)(x-y)] : [3(x+y) + 4(x-y) / (x-y)(x+y)]
→[(x-y-2x-y)/ (x+y)(x-y)] : [(3×+3y+4x-4y)/ (x-y)(x+y)
→(-x-2y)/(x+y)(x-y) : (7×-y)/(x-y)(x+y)
→ -x-2y / 7x-y