Salut
[tex]\frac{504}{1050}[/tex]
[tex]\frac{504/42}{1050/42}[/tex]
[tex]\frac{12}{1050/42}[/tex]
[tex]\frac{12}{25}[/tex]
[tex]\frac{504}{1050} - \frac{7}{25}[/tex]
[tex]\frac{12}{25} -\frac{7}{25}[/tex]
[tex]\frac{12-7}{25}[/tex]
[tex]\frac{5}{25}[/tex]
[tex]\frac{1}{5}[/tex]
