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2x + 3 = 18


Răspuns :

2x=18-3
2x=15
x=15/2
x=7.5
2 x + 3 = 18 
2 x = 18 - 3 
2 x = 15 
x = 15 : 2 
x = 7,5 

Verific:  2 × 7,5 + 3 = 15 + 3 = 18