Помогите пожалуйста. Заранее спасибо. Решите уравнение

1) 6 (х+1)^2 +2 (х-1) (х^2×х+1)-2 (х+1)^3=26;

2) 5х(х-3)^2-5 (х-1)^3+15 (х+2)(х-2)=5

3) (х+2)^3-х (3х+1)^2 +(2х+1) (4х^2-2х+1)=42
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