The given equation is : A = B + C
To solve the equation for B
Remove all the elements that are with B
A = B + C
Here, we don't want C with B
So, Subtract C from both side of equation :
A - C = B + C - C
A - C = B + 0
A - C = B
Reverse the elements : i.e. x = y into y = x
A - C = B on reverse becomes :
B = A - C
The solution for B is B = A - C
Answer : B = A - C