Răspuns:
[ 1140 - (909 : a - 809 )] : 130 = 8
[tex](1140 - \frac{909}{a} + 809) \times \frac{1}{130} = 8[/tex]
[tex](1949 - \frac{900}{a} ) \times \frac{1}{30} = 8[/tex]
[tex] \frac{1949a - 909}{130a} = 8[/tex]
1949a - 909 = 1040a
1949a - 1040a = 909
909a = 909
a = 909 : 909
a = 1
