There are many answers to this question!
If we are only concerning ourselves with positive integers then there are 36 combinations (e.g. 1 & 71, 2 & 70 etc...)
If we can include 0 then there are 37 combinations.
If we can include negative integers, or non-integers then there are an infinite number of answers.
72 + 72 = 144
49 + 72 + 68 = 189
72+30=102
180+72=252
You would formulate this problem X/100 * 150 = 72 and solve for X.
72 !
72
132
It is the property of n as the additive identity.
54(x)+52+32(y)+72=212
U = 4 x 18 U = 72
-6x+72=x then -7x=-72 so x=72/7