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(138×5-21:7-300×2)-9×9-r×2=2

Răspuns :

(138×5-21:7-300×2)-9×9-r×2=2
(690-3-600)-81-r×2=2
87-81-r×2=2
6-r×2=2
r×2=4
r=4:2=2