So, we have the mass multiplied by the density of the fluid multiplied by V bar, which is simply one over the density of the particle multiplied by omega squared multiplied by R minus FV. And the minus comes because we open up those parentheses and we set that equal to zero. So this is a bit crooked. So it's M omega squared R. Okay. So the next step is to basically collect the terms that appear on this term and this term. So, we have M and m, we have our omega squared, and we have the R. So this can be rewritten in the following method.