3(y+3y) = 12 what would be the fastestt way to find out y ?

3(y+3y) = 12
3y + 9y = 12
12y = 12
y = 1

12 y = 12
y = 1

3(y + 3y) = 12
3(4y) = 12
4y = 12/3
4y = 4
y = 4/4
y = 1

distribute:
3y+9y=12
combine lilke terms
12y=12
divide 12y bye 12
12y (cancels out) 12
----- ----
12y 12y
y=1

3(y+3y)=12
y+3y=9
4y=9
9/4=2.25

Y=1

3y + 9y (substituted the 3) = 12
12y = 12 (add the y values together)
y=1 (divide by 12)