We are given the expression B=3Mn/2 and told to express M in terms of B and n. This means that we should apply mathematical operations on both sides of the equation so we "isolate " M on one side of the equality sign. We begin with the given equation
First, we multiply both sides by 2, so we get
Next, we divide by 3 on both sides, so we get
Finally, we divide both sides by n, so we get
In this case, we have succesfully expressed M in terms of B and n