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![4x^{4}+132x^{3}+1565x^{2}+7920x+14400=0 \\ \\ 4x^{4}+32x^{3}+100x^{3}+800x^{2}+765x^{2}+6120x+1880x+14400=0 \\ \\ 4x^{3}(x+8)+100x^{2}(x+8)+765x(x+8)+1880(x+8)=0 \\ \\ (x+8) (4x^{3}+100x^{2}+765x+1880)=0 \\ \\ (x+8)(4x^{3}+30x^{2}+70x^{2}+525x+240x+1880) \\ \\ (x+8)[2x^{2} (2x+15)+35x(2x+15)+120(2x+15)]=0](/tpl/images/0758/5798/a921e.png)
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