x + l = 7, x - m = 5, x + p = 4, x - q = 2 হলে l + m + p + q এর মান কত?

প্রশ্ন: x + l = 7 , x - m = 5 , x + p = 4, x - q = 2 হলে l + m + p + q এর মান কত? 

সমাধান:
x + l = 7................(1)
x - m = 5................(2)
x + p = 4................(3)
x - q = 2................(4) 

(1) - (2) ⇒
x + l - (x - m) = 7 - 5 = 2
l + m = 2

(3) - (4) ⇒
x + p - (x - q) = 4 - 2
p + q = 2

l + m + p + q = 2 + 2 = 4