hola
-838 X N = R
-838 X 1 = -838
-838 X 2 = -1676
-838 X 3 = -2514
-838 X 4 = -3352
-838 X 5 = -4190
-838 X 6 = -5028
-838 X 7 = -5866
-838 X 8 = -6704
-838 X 9 = -7542
-838 X 10 = -8380
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