Ответы и объяснения

2013-11-09T20:42:43+04:00
- 2 (3,1x - 1) + 3 (1,2x + 1) = - 14,5
-6,2X-1+3,6x+3=-14,5
-6.2x+3.6x=-14.5+1
-2.6x=-13.5
x=5.1

2013-11-09T20:44:32+04:00
-6.2х + 2 + 3.6х + 3 = -14.5
- 2.6х + 5 = - 14.5
-2.6х = -19.5
х = -19.5 : ( -2.6)
х = 7.5