Question

3,5+9+(−3,94y)=−18+3,5−8,94y

Answer 1

3.5+9-3.94у=-18+3.5-8.94у
3.5+9-3.94у+18-3.5+8.94у=0
27=3.94у-8.94у
27=-5у

Answer 2

27 : (-5) ???Да?

Answer 3

3.5+9-3.94у=-15.5-8.94у
-3.94у+8.94у=-15.5-12.5
5у=-28
у=-5.6