Răspuns:
[tex]\frac{2x}{\frac{11+55}{121} } = \frac{6}{11}[/tex]
<=> [tex]2x*\frac{121}{66} = \frac{6}{11}[/tex]
<=> [tex]\frac{242x}{66} =\frac{6}{11}[/tex] => x=[tex]\frac{66*6}{242}[/tex] = [tex]\frac{396}{242}[/tex]=[tex]\frac{198}{121}[/tex] = 1,(63)
