Решите уравнение:
(1+x+x^2)(1+x+x^2+x^3+x^4)=(1+x+x^2+x^3)^2
И ещё одно:
(1+x+x^2+x^3)(1+x+x^2+x^3...+x^7)=(1+x+x^2+x^3+x^4+x^5)^2
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