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9-(25-16):3=[18-3•(9-9)]÷x

Răspuns :

9-9÷3=[18-3×0]:x
9-3=[18-0]:x
6=18:x
x=18:6
x=3
9-(25-16):3=[18-3•(9-9)] ÷x
9-9:3=(18-3•0) ÷ x
9-3=(18-0) ÷ x
6=18÷x
X=18÷6
X=3