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Cat da [2x(d=30)-45]x3=165 in metoda mersului invers.Vreau toata rezolvarea,dau coronita.

Răspuns :

[2(d-30)-45]•3=165=>(2d-60-45)•3=165=>
(2d-105)•3=165=>6d-315=165=>6d=165+315=>6d=480=>d=480:6=>d=80