4.25(3.11-а)-1.15=-4.4 Кпростите вырадение
4.25(3.11-а)-1.15=-4.4 4.25(3.11-а)=1.15+-4.4 4.25(3.11-а)=-3.25 3.11-а=-3.25/4.25 3.11-а=-0.7647059 а=3.11-0.7647059 а=2.3452941