(3x-1)²=49=(±7²)
3x-1=-7,3x-1=7
x=-2,x=8/3
x²-2x-3=0
(x+1)(x-3)=0
x=-1,x=3
(x-1)(x+2)=4
x²+x-2-4=0
x²+x-6=0
(x+3)(x-2)=0
x=-3,x=2
-6x²-7x=0
-x(6x+7)=0
x=0,x=-7/6