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[26-m×9:3]+108×7=900-84

Răspuns :

[26-m×9:3]+108×7=900-84
[26-m×3]+756=816
[26-m×3]=816-756
[26-m×3]=60
26-m=60:3
26-m=20
m=26-20
m=6
(26-mx3)+108x7=816    (26-mx3)+756=816    26-mx3=816-765  =51   26-mx3=51     mx3= 51-26   =  de aici rezolva singur