1) x=0,3; x2=-1/7
2)x^2+2x-3-2x-6=0
X^2-9=0
(x-3)(x+3)=0
X1=3; X2=-3
3)3x^2+7-12x-7=0
3x^2-12x=0
3x(x-4)=0
X=0; x2=4
1) x=0,3; x2=-1/7
2)x^2+2x-3-2x-6=0
X^2-9=0
(x-3)(x+3)=0
X1=3; X2=-3
3)3x^2+7-12x-7=0
3x^2-12x=0
3x(x-4)=0
X=0; x2=4