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It is: 7+13-6+5 = 19
-8 - (-13) = - 8 + 13 = +5 ( minus a minus is a plus)
-5
-4 minus 8 plus 5 is equal to -7
13 - 12 + 5 = 6
+1.
6
5
2
13 + 5 = 18
2 minus 2/5 plus 1/2 minus 4 = -1.9