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{54-144:[5x(7xa)-34]:2}:13=4

Răspuns :

54-144:(35a-34):2=4x13
54-144:(35a-34):2=52-54
-144:(35a-34):2=-2 (-1)
144:(35a-34)=2x2
35a-34=144:4
35a=36+34
a=70:35
a=2