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-x²+12x-5x+60=20x-30
-x²+7x+60=20x-30
-x²+7x-20x+60+30=0
-x²-13x+90=0
(-x+5)(x+18)=0
-x+5=0 x+18=0
-x=-5 x=-18
x=5 x= -18
conjunto de solucion x=5 x= -18