There's also a math problem, 4/x²-1+x+2/1-x=-1

There's also a math problem, 4/x²-1+x+2/1-x=-1

4/x²-1+x+2/1-x=-1
=4/x²=-1+1-2
=4/x²=-2
=4=-2*x²
X & # can't be negative!