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

Răspuns :

2x-14-14=28
2x-28=28
2x=28+28
2x=56
x=56/2
x=28
2(x-7)-14=28
2x-14-14=28
2x-28=28
2x=28+28
2x=56
x=56 supra 2
x=28