7x − 12z (x − y) − 7y.=7(x-y)-12z(x-y)=(x-y)(7-12z)
7x − 12z (x − y) − 7y
7x-7y -12z (x-y) = 7 (x-y) -12z (x-y) = (7-12z) (x-y)
7x − 12z (x − y) − 7y.=7(x-y)-12z(x-y)=(x-y)(7-12z)
7x − 12z (x − y) − 7y
7x-7y -12z (x-y) = 7 (x-y) -12z (x-y) = (7-12z) (x-y)