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rezolvati in multimea nr reala ecuatia: (5supra 7 - 5 supra 7x) : 10 supra 14 = 42 supra 21

Răspuns :

(5/7-5/7x):10/14=42/21
[(5x-5)/7x]·14/10=2
[(5x-5)/7x]·14=2·10
14(5x-5)/7x=20
70x-70=20·7x
70x-140x=70
-70x=70    inmultim -1
70x=-70
x=-70/70
x=-1