Question

completa las sumas

$- 5 + ( ) = 7$
$- 21 + () + 3 = 10$
$() + ( + 5) + ( - 6) = 3$
$() + ( + 2) = 1$
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Answer 1

- 5 + ( 12 ) = 7

- 21 + ( 28 ) + 3 = 10

( 4 ) + ( + 5) + ( - 6) = 3

( -1 ) + ( + 2) = 1