Question 1165495
Solve the equation a = m  -  n for the variable n.
        A.	n = a + m
	B.	n = m  -  a
	C.	n = a  -  m
	D.	n =  -  m  -  a
solution 
a=m-n where n is variable , we have to find the value of n . keeping  n positive shift to other side and a to other side n negative change to positive and a change to negative 
so equation will be 
n=m-a 
option B is right answer