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Salutare!
[tex]3 {}^{21} - 3 \times (3 {}^{2} \times 3 {}^{3} ) {}^{4} + 7 {}^{0} = \\ 3 {}^{21} - 3 \times (3 {}^{5} ) {}^{4} + 7 {}^{0} = \\ 3 {}^{21} - 3 \times (3 {}^{5} ) {}^{4} + 1 = \\ 3 {}^{21} - 3 \times 3 {}^{20} + 1 = \\ 3 {}^{21} - 3 {}^{21} + 1 = \\ 0 + 1 = \\ 0[/tex]
#Succes!
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