What do you mean by "solve"? What is the relationship between the two variables "X" and "x"? Are you needing to solve a differential equation? Perhaps for "v" in terms of "x"?How to solve (1-X)dv/dx-2x=0?
What are your thoughts? What have you done so far? Please show us your work even if you feel that it is wrong so we may try to help you. You might also readHow to solve (1-X)dv/dx-2x=0?