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13 / 21 = 10×x -21/8×x+15​

Răspuns :

[tex]\frac{13}{21}=\frac{(10x-21)}{(8x+15)}\\\\13(8x+15)=21(10x-21)\\\\104x+195=210x-441\\195+441=210x-104x\\636=106x\\x=636/106\\x=6[/tex]