помогите выруйте очень срочно надо .решите уравнение:
1) (х^2- 5x) + 5 – x=0.
2) 3x^2 – 18x +(6 – x) = 0.
3) x^2 – 9x – (x – 9)=0.
4) 4x – x^2 – (2x – 8)=0
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