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(2x/x+y) - (x+y/x+y) : (ײ + xy + 2xy -xy -y²) / (x+y) ⇒ { semua unsur yang sama di matikan }
(x+y) / (x+y) : (ײ+2xy-y²) / (x+y)
penyebut di balik agar dapat dikali.
(x+y) / (x+y) × (x+y) / (x²+2xy-y²)
jadi, (x+y) / (x²+2xy-y²)