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cum se rezolva asta 19/21=4x-1/4x+1

Răspuns :

19/21=(4x-1)/(4x+1)

21(4x-1)=19(4x+1)
84x−21=76x+19
8x=40 => x=5

Sau, mai simplu:

19=4x-1 => 20=4x => x=5
21=4x+1 => 20=4x => x=5