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Default FINDING THE UNKNOWN NUMBER

Is it possible to find the unknown if I have the following:
C70=18
C69=9
C71=UNKNOWN

(C70-C69)+(C71-C70)=J71
C71-J71=C70

How do I used excel to find the C71 UNKNOWN????? Right now I can put any number as the unknown and it auto-calculate for me, but the answer is not correct. Please help.

thanks

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