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Rezolvati ecuatiile in metoda balantei :
a)9-2X=X+3
b)3(X+2)-1 = X+7
c)4(2X+1)-(11-2*3)X= 6


Răspuns :

-2x-x=3-9
3x=-3
x=1
prima am rezolvat-o
9-2x=x+3. 9-3=x+2x. 6=3x. x=6:3. x=2
3(x+2)-1=x+7.
3x+6-1=x+7. 3x-x=7-5
2x=2. x=1