Question 16109
12X-X=15180

What is 12-1? 11.
Similarly instead of seeing this as 12X-X see this as 12X - 1.X  or X(12-1) which is equal to X.11
Now since we want the value of X alone,we divide both sides with 11
X = 15180/11 = 1380

There's your answer X = 1380