solve problems ................
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(x+2=0
x=-2.
x³-9x²-12x+20.
(-2)³-9(-2)²-12×-2+20.
-8-36+24+20.
44-44=0.
x=-2.
x³-9x²-12x+20.
(-2)³-9(-2)²-12×-2+20.
-8-36+24+20.
44-44=0.
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