Hey there!!
Given equation :-
... 4y - ( y - 4 ) = -20
Let' re write this equation as :
... 4y -1 ( y - 4 ) = -20
Using the distributive property :
... 4y + ( -1 ) ( y ) + ( -1 ) ( -4 ) = -20
... 4y - y + 4 = -20
Combining like terms :
... 3y + 4 = -20
Subtracting 4 on both sides :
... 3y = -24
Dividing by 3 on both sides :
... y = -24/3
... y = -8
Hope my answer helps!!