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rezolva ti ecuatile7x-1 <13

Răspuns :

7x-1 mai mic 13
7x m m 13+1
7x m m 14
x m m 2

x apaetine (0.1 )
-13<7x-1<13 /+1
-12<7x<14 /:7
-1.71<x<2