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multiplicamos 3x para evitar la fracción:
3x(4x) - 3x(1/3x) - 3x(4) = 0
12x^2 - 1 - 12x = 0
12x^2 - 12x - 1 = 0
por la ecuación cuadrática general:
x = (12 +- √(144 + 48))/2(12)
= (12 +- 13.86)/24
x1 = 25.86/24
x2 = -1.86/24
8x - 2 - 21x - 28 = 0
-13x - 30 = 0
13x = -30
x = -30/13
-13x - 2 =-28
28 -2 = 13x
16 = 13x
16/13 = x
2 = x