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(6x5+4xj-8):6=28:4 ;  
(8x8-32:12:k)-(40-2x10)=3x3


Răspuns :

(6x5+4xj-8):6=28:4
(30+4j-8):6=7
(22+4j):6=7
22+4j=6x7
4j=42-22
4j=20:4
j=5