раскроем скобки
1.9+1.8x-2.6 = 6.4+3.6x-1.3
-1.8x-5.8 = 0
1.8x+5.8 = 0
1.8x = -5.8
x = -3.2222222222222
раскроем скобки
1.9+1.8x-2.6 = 6.4+3.6x-1.3
-1.8x-5.8 = 0
1.8x+5.8 = 0
1.8x = -5.8
x = -3.2222222222222