Question

{54+[72:2+(7.9-6:2)]+3}:9 ?

Answer 1

{54+[72:2+(7.9-6:2)]+3}:9
{54+[72:2+(63-3)]+3}:9
{54+[72:2+60)]+3}:9
{54+[36+60)]+3}:9
{54+96+3}:9
{54+96+3}:9
153:9 = 17

Answer 2

$\{54+[72:2+(7*9-6:2)]+3\}:9 \\ \\ \{54+[72:2+(63-3)]+3\}:9 \\ \\ \{54+[36+60+3]\}:9 \\ \\ \{54+36+60+3\}:9 \\ \\ \boxed{153:9 = 17}$

Espero ter ajudado. :))