Question: solve 3 eqations with 3 variables

 

Hey 

i want to solve these 3 eqations 

21000 = ((10/1000)/60)*4181*983*(x-y)

H = -((10/1000)/60)*4181*ln(1-((x-y)/(x-40)))

H = 124+102'ln(x-40)+(7+2*ln(x-40))

 

with the result of:

H,x,y

 

how do i do that?

 

Thanks

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