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-------------------------= -----------
x(x+2)(x+1)
x²+2x+x+2+x²+2x-x²-x
---------------------------------- =0
x(x+1)(x+2)
x²-4x+2
------------
x(x+1)(x+2)
x²-4x+2)(x)(x+1)(x+2)=0
Δ=16-8=8
x1=2√2
x2=-2√2
x=0
x=-1
x=-2