A panel is supported on supports a and b. A 60-kg person walks on the board from point a. Despise the deformation of the table

A) find its expression for the magnitude of the force exerted by each support in function x of the person
B) in what position will the person be found at the instant when the tab begins to separate from the support a?

i try to find the net force but i just can't do it

can someone help pls? me am really lost