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625x+x=0
626x=0 /:626
x=0
2) 4x^5 - x = 0
256x-x=0
255x=0 /:256
x=0
3) x^3 + 3x^2 - 9x - 27 = 0
x+9x-9x-27=0
x=27
4) x^4 + 6x^3 + 5x^2 = 0
x+108x+25x=0
134x=0 /:134
x=0
2x^3 + 3x^2 - 4x - 6 = 0
8x+9x-4x-6=0
7x=0 /:7
x=0
1024x-x=0
1023x=0