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[tex] \frac{11}{4}x- \frac{5}{7}x=57 [/tex]


Răspuns :

[tex]\displaystyle \frac{11}{4} x- \frac{5}{7} x=57 \\ 77x-20x=57 \cdot 28 \\ 77x-20x=1596 \\ 57x=1596 \\ x= \frac{1596}{57} \\ x=28[/tex]