-5 + (+7 - 3 + 5 - 6) - (+12 - 5 - 6 + 7)
-5 + (+7 - 3 + 5 - 6) - (+12 - 5 - 6 + 7)
$-5 + (+7 - 3 + 5 - 6) - (+12 - 5 - 6 + 7)$ =
= $-5+(+3)-(+8)$ =
= $-5+3-8$ =
= $-10$
=-5+3-8
=-10
-5 + (+7 - 3 + 5 - 6) - (+12 - 5 - 6 + 7)
-5 + 3 - 8 = -10