Find missing integer to complete the subtraction sentence:

-40-(-40)=_______.

Find missing integer to complete the subtraction sentence:

-6-_____=-12.

Find missing integer to complete the subtraction sentence:

______-3=-20.

Find missing integer to complete the subtraction sentence:

_____-(-30)=40.

Find missing integer to complete the subtraction sentence:

-50-______=-60.

Find missing integer to complete the subtraction sentence:

-15-_______=-20.

Find missing integer to complete the subtraction sentence:

_______-3=-12.

Find missing integer to complete the subtraction sentence:

-6-_____=-20.

Find missing integer to complete the subtraction sentence:

-40-_______=-70.

Find missing integer to complete the subtraction sentence:

-10-3=_____.