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x³+1≠0
x³≠-1
x≠-1
2x/x³+1=x mnożę przez x³+1
2x=(x³+1)x
x⁴+x-2x=0
x⁴-x=0
x(x³-1)=0
x=0 v x³-1=0
x=0 v x=1
rozw x=0 vx=1