Question

(+6)+(+7)=
(-6)+(-6)=
(+7)-(-8)=

Answer 1

$1) \: ( + 6) + ( + 7) = 1 3 \\ 2) \: ( - 6) + ( - 6) = - 12 \\ 3) \: ( + 7 -) - ( - 8) = 15$

Answer 2

(+6)+(+7)=13

(-6)+(-6)= -12

(+7)-(-8)= 15