20*2⁴ⁿ⁻⁵-80*(4ⁿ⁻²)²=
=20*2⁴ⁿ⁻⁵-80*4⁽ⁿ⁻²⁾²=
=20*2⁴ⁿ⁻⁵-80*4²ⁿ⁻⁴=
=20*2⁴ⁿ⁻⁵-80*2⁴ⁿ⁻⁸=
=(20*2³-80)*2⁴ⁿ⁻⁸=
=(20*8-80)*2⁴ⁿ⁻⁸=
=(160-80)*2⁴ⁿ⁻⁸=
=80*2⁴ⁿ⁻⁸
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20*2⁴ⁿ⁻⁵-80*(4ⁿ⁻²)²=
=20*2⁴ⁿ⁻⁵-80*4⁽ⁿ⁻²⁾²=
=20*2⁴ⁿ⁻⁵-80*4²ⁿ⁻⁴=
=20*2⁴ⁿ⁻⁵-80*2⁴ⁿ⁻⁸=
=(20*2³-80)*2⁴ⁿ⁻⁸=
=(20*8-80)*2⁴ⁿ⁻⁸=
=(160-80)*2⁴ⁿ⁻⁸=
=80*2⁴ⁿ⁻⁸