2,7+3y=9*(y-2,1) помогите

Question

2,7+3y=9*(y-2,1) помогите

Answer 1

2,7+3y=9*(y-2,1) 
2.7+3y=9y-18.9
3y-9y=-18.9-2.7
-6y=-21.6
y=3.6

Answer 2

2,7+ 3у = 9у - 18,9
3у - 9у = - 18,9 - 2,7
-6у = - 21,6
6у = 21,6 
у = 21,6: 6
у = 3,6