5xy(5x+6) - 25x2y+30xy, 3x(-y+7x) - -3xy+21x2, -4x(yx-z) - -4x2y+4xz, 5(25xy+5x+y) - 125xy+25x+5y, Cannot be factorised! - 9y+10x,

Factorising/Expanding Brackets (Harder Version)

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