hola
-940 X N = R
-940 X 1 = -940
-940 X 2 = -1880
-940 X 3 = -2820
-940 X 4 = -3760
-940 X 5 = -4700
-940 X 6 = -5640
-940 X 7 = -6580
-940 X 8 = -7520
-940 X 9 = -8460
-940 X 10 = -9400
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