Question: plot a function

Question:plot a function

pely 0 Maple

(10-(1/2)*d)*d-(Pw+tau)*d+(1/2)*x^2-2*x-2*X+tau*d+(10-(1/2)*DE)*DE-(Pw+Tau)*DE+(1/2)*X^2+Tau*DEhi,

 

how i could plot the above equation in a specific range of tau and Tau when all the other parameters all also a function of these two variables?

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