2【2x加1】方减8【x加1】【x减1】等於34

2【2x加1】方减8【x加1】【x减1】等於34

2(4x^2 +4x+1)-8(x^2-1)=34
8x^2+8x+2-8x^2+8=34
8x+10=34
8x=24
x=3