1. 0.4а - b - a - 0.6b = - 0.6a - 1.6b. 2. 0.6x + 4.2 - 0.5x + 1.5 = 6.8; 0.1x = 6.8 - 4.2 - 1.5; 0.1x = 1.1; x = 1.1 : 0.1; x = 11.