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afla nr natural x stiind ca 2*(x+7)-14=28

Răspuns :

2*(x+7)=28+14
2*(x+7)=42
x+7=42/2
x+7=21
x=21-7
x=14
2x+14=28 2x=28-14 2x=14 x=14÷2 x=7