indica si son propias impropias o aparentes
7
_
9
3
_
2
3
_
8
2
_
2
18
_
20
13
_
18
9
_
9
14
_
4
15
_
5
6
_
2
7
_
9
3
_
2
3
_
8
2
_
2
18
_
20
13
_
18
9
_
9
14
_
4
15
_
5
6
_
2
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Explicación paso a paso:
7+2 =9 3-1=2 3+ 5= 8 2-0=2