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Verified answer
(63a³b⁴c²:7ab²c)³(63a³b⁴c²:7ab²c)
= (63:7) . (a³b⁴c² : ab²c)
= 9 (a³⁻¹ b⁴⁻² c²⁻¹)
= 9a²b²c
(63a³b⁴c²:7ab²c)³
= (9a²b²c)³
= (9³). (a²b²c)³
= 729 . (a²ˣ³ b²ˣ³ c¹ˣ³)
= 729a⁶b⁶c³