3+4 (y+1)=6 (4-y) pake cara ya....

3 + 4 ( y + 1) = 6 ( 4 - y)
3 + 4y + 4 = 24 - 6y
3 + 4 - 24 = - 6y - 4y
7 - 24 = - 10 y
- 17 = - 10y
- 10y = - 17
Y = - 17 : - 10
Y = 1 7/10

Semoga membantu maaf kalau salah