Salut!:)
(5x-2):9=7
(5x-2)=9×7
5x-2=63
5x=63+2
5x=65⇒x=65:5⇒x=13
Succes!
Răspuns: x = 13
[tex](5x-2):9=7~~~\big|_{\cdot9}[/tex]
[tex](5x-2):9\cdot 9 = 7\cdot9[/tex]
[tex]5x-2 = 63[/tex]
[tex]5x = 63+2[/tex]
[tex]5x = 65[/tex]
[tex]x = 65:5[/tex]
[tex]\boxed{x = 13}[/tex]
