（3x-1）²+1-3x=6 4x²-6x-4=0 a²-4a-7=0 x²+4x-2=0

（3x-1）²+1-3x=6 4x²-6x-4=0 a²-4a-7=0 x²+4x-2=0
（3x-1）²+1-3x=6 4x²-6x-4=0 a²-4a-7=0 x²+4x-2=0

（3x-1）²+1-3x=6 4x²-6x-4=0 a²-4a-7=0 x²+4x-2=0
（3x-1）²+1-3x=6
(3x-1)²-(3x-1)-6=0
(3x-1-3)(3x-1+2)=0
x=4/3 x=-1/3
4x²-6x-4=0
2x²-3x-2=0
(2x+1)(x-2)=0
x=-1/2 x=2
a²-4a-7=0
a²-4a+4=11
(a-2)²=11
a=2+√11 a=2-√11
x²+4x-2=0
x²+4x+4=6
(x+2)²=6
x=-2+√6 x=-2-√6