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[A,B,C,D,a,h]
=solve('(9-2a)*h+2*a*h*(A*(a/9)+B*(a/9)^2+C*(a/9)^3+D*(a/9)^4)=1',
'(18-2a)*h+2*a*h*(A*(a/18)+B*(a/18)^2+C*(a/18)^3+D*(a/18)^4)=0.89',
'(36-2a)*h+2*a*h*(A*(a/36)+B*(a/36)^2+C*(a/36)^3+D*(a/36)^4)=0.84',
'(54-2a)*h+2*a*h*(A*(a/54)+B*(a/54)^2+C*(a/54)^3+D*(a/54)^4)=0.78',
'(72-2a)*h+2*a*h*(A*(a/72)+B*(a/72)^2+C*(a/72)^3+D*(a/72)^4)=0.60',
'(108-2a)*h+2*a*h*(A*(a/108)+B*(a/108)^2+C*(a/108)^3+D*(a/108)^4)=0.39')
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