You have 7up as : 7^7^7^7^7^7^7 , And you want to make it as : 7^7^7^7^7^x^2 , then find the value of x .
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7^7 = X^2
7 log7 = 2 logx
log x = 7 log 7/2 = 2.938
x = 907.5