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(12x mas 2)/2 ((12x mas 3)/3) mas ((12x mas 4)/4) = 12x mas 2
6x mas 1 mas 4x mas 1 mas 3x mas 1 = 12x mas 2
13x mas 3 = 12x mas 2
x = -1
-12 mas 2 = -10
-12 mas 3 = -9
-12 mas 4 = -8