1)(3x^2+7x-20)/(x+4)=0
3x^2+7x-20=0
D=7^2-4*3*(-20)=49+240=289
x1=(-7+7)/6=0/6=0
x2=(-7-7)/6=-14/6=-2 1/3
2)(x-4)/x=(2x-5)/(x-6)
(x-4)/x-(2x-5)|(x-6)=0
(x-6)(x-4)/x(x-6)-(x(2x-5))/x(x-6)=0
x^2-10x+24-(2x^2-5x)=0
x^2-10x+24-2x^2+5x=0
-x^2-5x+24=0
D=(-5)^2-4*(-1)*24=25+96=121
x1=(5+11)/-2=-8
x2-(5-11)/-2=3