(nr descărcări electrice anual 1 176000) repede va rog

Explicație pas cu pas:
Inlocuim si aducem la acelasi numitor comun:
[tex]\frac{3x+6}{1176000} - \frac{1}{1000} = 0\\\\\frac{3x+6}{1176000} - \frac{1176}{1176000} = 0\\\\\frac{3x+6-1176}{1176000} = 0\\\\3x-1170 = 0\\3x=1170\\\\x=\frac{1170}{3}\\\\x=390[/tex]