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more than 1 function with Plot3D


Hi,
I would like to plot the functions

u(x1,x2) = (x1+20)*x2 (main function)    ->Nutzenfunktion

20 = 2x1 + x2                                        ->Budgetgeraden
60 = 2x2 + x2                                        ->Budgetgeraden

800 = (x1+20)*x2                                    -> Indifferenzkurve

(Volkswirtschaftslehre VWL)

Is it somehow possible, I'd like to have all functions in one graph.

So far:
Plot3D[(a + 20)b, {a, 0, 30}, {b, 0, 30}, AxesLabel -> {"x1", "x2", 
"Nutzen"}]


THX 



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