Răspuns :
a) 5x=7(x-4) <=> -2x=-28 =>x=14
b) [tex] \frac{x-1}{2} =[tex] \frac{x+11}{4} [/tex]<=> 2x-x=11+2 =>x=13
b) [tex] \frac{x-1}{2} =[tex] \frac{x+11}{4} [/tex]<=> 2x-x=11+2 =>x=13
5x=7x-28
-2x=-28
X=14
2x-2=x+11(am amplificat cu 2 in prima ca sa scapam de numitori)
X=13