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aflati numarul natural x,stiind ca:2×(x+7)-14=28.

Răspuns :

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