Answer:
-30 - 40 - 70, see below
Step-by-step explanation:
+- combines to -
++ combines to +
-+ combines to -
-- combines to +
-30 + (-40) + (-70)
-30 - 40 - 70
:)
-140
-30+(-40)+(-70)
-30-40-70
-70-70
I think this is the answer, I hope it's what you're looking for
