First, multiply the 3 to the 2 in order to get 6(x+1)=108
Second, multiply the 6 to the x and the 1 in order to get 6x+6=108
Third, subtract 6 from 108 in order to get 102
Fourth, now that you have 6x=102, divide the 6 out of the 102 to get x=17
17 is your answer.
Hope this helps!