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X = 1 + 2^3 + 4*5 - 6*7^8

Pressures=-16.6999-(0.0101059*Temperature)+(0.00116512*(Temperature^2)
+)+(0.1733554*(Temperature)*(Volumes))+(4.24267*(Volumes))-(0.0684226*
+(Volumes^2))

$temp = 40;
$vol = 2.5;
$pressure=(-16.6999)-(0.0101059*$temp)+(0.00116512*($temp^2))+(0.17335
+4*$temp*$vol)+(4.24267*$vol)-(0.0684226*($vol^2));