вставьте пропущенное число
а) -9-...=11
9-...=-5
-9-...=5
б) ...-7=-15
...-7=2
...-(-7)=-2
в) -9-...=-11
-8-...=16
-7-...=-20
г) ...-(-7)=15
...-5=-11
...-9=4

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