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5 x -9 +2x=19 multumesc antcipat!

Răspuns :

5x-9+2x=19

trecem in stanga termenii cu x si in dreapta cei care nu au x:

5x+2x=19+9
7x=28/:7
x=4
5x-9+2x=19
5x+2x=19+9
7x=28:7
7x=4
x=4