Answer:
(1 - 1) - (-1 - 3)
0 + 4 = 4
Explanation:
4
a=3
b=1
c=-1
(b + c) - (c-a)
(1+(-1))-((-1)-(3))
Note
+*-= -
+*+=+
-*-=+
So
(1-1)-(-1-3)
0-(-4)
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