7х=35/84-9/12 2х=60/68-7/17 7х=35/84-63/84 2х=60/68-28/68 7х=-28/84=-1/3 2х=32/68=8/17 х=-1/3:7/1 х=8/17:2/1 х=-1/3*1/7 х=8/17*1/2 х=-1/21 х=4/17