Exericitul 1
[tex]3x-11=4x
3x-11-4x=0
-x-11=0
-x=11/(-1)
x=-11
[/tex]
Exercitiul 2
[tex]2,6x+1=8,8
2,6x=8,8-1
2,6x=7,8
[/tex]
[tex]x= \frac{7,8}{2,6}= \frac{ \frac{78}{10} }{ \frac{26}{10} }= \frac{78}{10} * \frac{10}{26}= \frac{78}{26}=3 [/tex]
La ultimul exercitiu faci produsul mezilor = cu produsul extremilor
[tex]3x-7= \frac{x-1}{3} [/tex]
Aducem la acelasi numitor comun cu 3!
3(3x-7)=x-1
9x-21=x-1
9x-21-x+1=0
8x-20=0
8x=20
x=20/8=10/4= 5/2
