-9(5,1а+3,2)+4(0,3a-1,5)

-9(5.1а+3.2)+4(0.3а-1.5) -45.9а-28.8+1.2а-6 -45.9а+1.2а=-6+28.8 -44.7а=22.8 а=22.8:-44.7 а=-.051