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[119+36:(120-7a)]:4-1=29

Răspuns :

[119+36: (120-7a)]:4=1+29=30
119+36:(120-7a) =30×4=120
36:(120-7a) =120-119=1
120 - 7a= 36:1
120 - 7a= 36
7a=120-36= 84
a=84:7 = 12

Sper ca te-am ajutat!