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x²+1=4x+x²-1/-x²
1=4x-1/+1
2=4x/:4
x= ½
x²-2x+1+2x=4x(x²-1)
x²-2x+1+2x=4x+x²-1 tu skracasz:x²,2x,2x,x²
-4x=-2/:(-4)
x=½