6х=3 х=6:3 Х=2 ------------- Х-4=0 Х=4+0 Х=4 ------------ 3х+7=х-5 3х-х = -5-7 2х=-12 Х=-12:2 Х=-6 -------------------- 2х+7=11 2х=11-7 2х=4 Х=4:2 х=2 ------------------