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xyz(3xy^2z^4-9x^2y^4z^2)
9z^3(1/2x^2y^3z^2-x^3y^5)
u^2v^2(v^2-5v^2)
5uv(1/5uv^3-u^3v)
-5v^2(-1/5u^2v^2+u^4)
^-oznacza do potęgi