The ink splash

The solutions of this 3rd degree equation

are also solutions of this 4th degree equation

Ink splashes cover parts of equations. Despite the splashes could you find the solutions of the 3rd degree equation, knowing they are integers (positive or negative) ?
And on the way could you as well give the fourth solution of the 4th degree equation ?
What was hidden under the splashes ?
Solution    Hint    Details

 

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