Question 11367
3(x+4 -1) =15    The (x+4-1)is divided by 2     
     2

3(x+3)=15
   2

Divide 3 from both sides;

x+3 = 15/3 
 2

multiply 2 to both sides;

x+3 = 5(2)

subtract 3 from both sides;

x = 10-3
x=7

check:
3(7+4-1) = 15
    2

3(10) = 15
   2

30/2 = 15

15=15