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12x * 84x = 1008 x^2
12x *49 = 588x
-7 * 144x^2 = -1008 x^2
-7 * 84x= 588x
-7*49 = -343
1728x^3 + 1008x^2-1008x^2 + 588x-588x -343
eliminas semejantes y queda
1728 x^3 - 343