hola
-20 X N = R
-20 X 1 = -20
-20 X 2 = -40
-20 X 3 = -60
-20 X 4 = -80
-20 X 5 = -100
-20 X 6 = -120
-20 X 7 = -140
-20 X 8 = -160
-20 X 9 = -180
-20 X 10 = -200
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