[(7²)¹¹ₓ 7³):(7²³ₓ (6⁰+36¹²:6²³)}=
=[(7²²ₓ 7³):(7²³ₓ (1+(2²ₓ 3²)¹²:(2*3)²³)}=
=[7²⁵:(7²³ₓ (1+2²⁴*3²⁴:2²³ₓ 3²³)}=
=[7²⁵:[7²³ₓ (1+2¹ₓ 3¹)]=
=[7²⁵:[7²³ₓ 7)]=
=[7²⁵: 7²⁴]=
=7²⁵-²⁴=
=7
