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9x³+18x²-4x-8=0
9x²(x+2) -4(x+2)=0
(9x²-4)(x+2)=0
(3x+2)(3x-2)(x+2)=0
3x+2=0 ∨3x-2=0∨x+2=0
x=-2/3∨x=2/3∨x=-2