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2×(x+3.9)+1.2=20.04 ba rog dau coroana

Răspuns :

2x + 7,8 + 1,2 = 20,04
2x + 9 = 20,04
2x = 20.04 - 9 
2x = 11,04
x = 11,04 :2 
x = 5,52