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Cum se rezolava problema 2(x+1)=18

Răspuns :

2(x+1)=18
x+1=18:2
x+1=9
x=9-1
x=8
2·x+2·1=18
2·x=18-2
2x=16
x=16÷2 (sau supra,mai bine supra)
x=8