Решите уравнение 2,1*(0.9-х) =1.26

2,1*(0.9-х) =1.26 2,1*0,9-2,1х=1,26 1,89-1,26=2,1х 0,63/2,1=х х=0,3

2.1*(0.9-х)=1.26 2.1*0.9-2.1х=1.26 1.89-2.1х=1.26 -2.1х=1.26-1.89 -2.1х=-0.63 х=-0.63:-2.1 х=0.3