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7-[100×52:13-5×(3×120-2×x)]:20=2

Răspuns :

7-[ 5200:13-5*(360-2x)] = 40
7- ( 400-5*360 - 10x) = 40
7- ( 400-1800- 10 x) = 40
7 - ( - 1400 - 10 x) = 40
7 + 1400 + 10 x = 40
10 x = 40-7-1400
10x= -1367
x = - 136.7
Sper sa fie bine. :)))