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Multiplicamos a 3x por el paréntesis:
6x²-12x= (3x-1)+20
Sacamos a los números del paréntesis por medio del signo:
6x²-12x= 3x-1+20
6x²-12x= 3x+19
6x²-12x-3x+19= 0
6x²-15x+19= 0
x= -(-15)+√(-15)²-4*6*(-19)/2*6
x= 15+√225+456/12
x= 15+√681/12