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Rezolvati ecuatiile : a) 5X=7(x-4) b) x-1 supra 2 = x+11 supra 4

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
5x=7x-28 -2x=-28 X=14 2x-2=x+11(am amplificat cu 2 in prima ca sa scapam de numitori) X=13