Показательное уравнение:
4^x-1 + 4^x + 4^x+1 =84
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Verified answer
4^x-1 + 4^x + 4^x+1 =844^(x-1)(1+4+16)=84
4^(x-1)*21=84
4^(x-1)=4
x-1=1
x=2