Answer:
It's gonna be -9 because u add 5+4=9 and u put - for 9
-9
Explanation:
-1 -2 -3 -4 -5 -6 -7 -8 -9 -10
+(-1)
+(-2)
+(-3)
+(-4)
+(-5)
-4 + -5 = -9
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