0.9*(b-5)-(b-2)=2.3 помогите

0.9b-4.5-b+2=2.3
-0.1b=2.3+4.5-2
-0.1b=4.8
b=4,8/(-0.1)
b=-48

[tex]0.9*(b-5)-(b-2)=2.3\\0.9b-4.5-b+2=2.3\\-0.1b=4.8\\b=-48[/tex]