Expandindo `9999999` em potências de `10`
`(9999999)_{10} =`
`=9\cdot 10^{6} + 9\cdot 10^{5} + 9\cdot 10^{4} + 9\cdot 10^{3} + 9\cdot 10^{2} + 9\cdot 10^{1} + 9\cdot 10^{0}`
`= (\text{9999999})_{10}`
`(9999999)_{10} =`
`=9\cdot 10^{6} + 9\cdot 10^{5} + 9\cdot 10^{4} + 9\cdot 10^{3} + 9\cdot 10^{2} + 9\cdot 10^{1} + 9\cdot 10^{0}`
`= (\text{9999999})_{10}`