2(x-2)*(x+2)-(x-1)²=x²-5
2(x²-4)-(x²-2x+1)=x²-5
2x²-8-x²+2x-1=x²-5
x²-9+2x=x²-5
-9+2x=-5
2x=-5+9
2x=4
x=2
