Advanced Real world

Analyze the patterns and solve the equations!

1) Solve
304-166=
2) Solve
43434-30187=
3) Solve
819030-587403=
4) Solve
7541-7020=
5) Solve
73140-48799=
6) Solve
2197-1628=
7) Solve
342746-170891=
8) Solve
6537-2422=
9) Solve
90934-84027=
10) Solve
835478-693303=
11) Solve
1192-1075=
12) Solve
695-400=
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