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2×(x+7)-14=28 aflati x



Răspuns :

2×(x+7)-14=28
2×(x+7)=28+14
2×(x+7)=42
x+7=42:2
x+7=21
x=21-7
x=14

2*(x+7)=28+14=42 X+7=42:2=21 X=21-7=14