А) 3х-12=х; б) 2х+6=4х-2; в)3х-2=6+4х; г)2х-4(х+7)=3(2-х).
А. 3х -12 = х 3х -х = 12 2х = 12 х = 12 : 2 = 6 б. 2х + 6 = 4х - 2 2х - 4х = - 2 - 6 -2х = -8 х = -8 : (-2) = 4 в. 3х - 2 = 6 + 4х 3х -4х = 6 + 2 -х = 8 х = -8 г. 2х - 4(х+7) = 3(2-х) 2х - 4х - 28 = 6 - 3х 2х - 4х + 3х = 6 + 28 х = 34