Помогите пожалуйста решить уравнение!!! 1. 6(x+1)^2+2 (x-1)(x^2+
x+1)-2(x+1)^3=26
2. 5x (x-3)^2-5 (x-1)^3+
15 (x +2)(x-2)=5
3. (x +2)^3-x (3x +1)^2+
(2x +1)(4x^2-2x +1)=42
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