Unknown number

I think number. If subtract from the twelfth square the ninth square I get a number 27 times greater than the intended number. What is this unknown number?

Correct result:

n1 =  0
n2 =  1.4053

Solution:

n12n9=27n n(n11n827)=0 n1=0
n2=1.40529=1.4053



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