11х-3=-3-12х -2х+4=0,5х-21
11х - 3 = -3 - 12х -2х + 4 = 0,5х - 21
11х + 12х = 3 - 3 -2х - 0,5х = -21 - 4
23х = 0 -2,5х = -25
х = 0 : 23 х = -25 : (-2,5)
х = 0 х = 10