What the fuck are you even trying to say there Shinto? Are you expressing y as a function of x, x2, and x3, which is the same function squared of x2 and x3 plus 1? Honestly, that notation is shit...
Are you asking for the impulse function or something (Which is what h(x) is usually denoted by)?
So, do you want us to solve for x, x1, and x2 given those equations?
Heh, its just weird because you are giving random equations with a few variables. BTW, why didn't you just name x2 = y, and x3 = z so you don't have to have all the subscript text...?