(x-1)(x+3)=12
x²+2x-3=12
x²+2x-15=0
(x-3)(x+5)=0
x=3或x=-5
(3x-5)(2x-1)=-12x+7
6x²-13x+5=-12x+7
6x²-x-2=0
(2x+1)(3x-2)=0
x=-1/2或x=2/3
(x-1)(x+3)=12
x²+2x-3=12
x²+2x-15=0
(x-3)(x+5)=0
x=3或x=-5
(3x-5)(2x-1)=-12x+7
6x²-13x+5=-12x+7
6x²-x-2=0
(2x+1)(3x-2)=0
x=-1/2或x=2/3