The given equation is f=-N+B/m. This equation represents a relationship between the variables f, N, B, and m. The equation can be rearranged to solve for any one of the variables in terms of the others. Here are the steps to solve for B:
Add N to both sides of the equation to isolate B/m on one side: f+N=B/m
Multiply both sides of the equation by m to isolate B: B=fm+Nm
Therefore, the equation to solve for B is B=fm+Nm.