Question

1) (-6)+(-7)=×
2) -7+×=-7
3) -6+×=0
$- frac{2}{3} + ( - frac{1}{3} ) = x$
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Answer 1

1)

$( - 6) + ( - 7) =x \ - 13 = x \ x = - 13$

2)

$- 7 + x = - 7 \ x = - 7 + 7 \ x = 0$

3)

$- 6 + x = 0 \ x = 6$

4)

$- frac{2}{3} + ( - frac{1}{3} ) = x \ - frac{3}{3} = x \ x = - 1$