El profesor se sorprenderá mucho al ver tu solución correcta😉
/1\ -12 + 5*x + 3*x*x + 80*log|-| = 0 \x/
x1 = 6.57794452495106
x2 = 0.944050446272509
x3 = 6.57794452495106 - 7.86963507940525e-17*i
x4 = 6.57794452495105 + 1.86746712260855e-15*i
x4 = 6.57794452495105 + 1.86746712260855e-15*i