Find the sum:
−
3
+
−
7
+
−
11
+
…
+
−
39
\displaystyle -{3}+-{7}+-{11}+\ldots+-{39}
−
3
+
−
7
+
−
11
+
…
+
−
39
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity