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100-[36+6×9-(a:3+15)]:3=4

Răspuns :

100-[36+6×9-(a:3+15)]:3=4
3+15=18
100-(36+6×9-a)÷3=4
6×9=54
53+36=89
100-89-a÷3=4
100-89=11
11-a÷3=4
3×4÷12
11-12=4