x-y - 3x^2 + 3y^2 разложить на множители
x-y - 3x^2 + 3y^2 = (3y^2-y) - (3x^2-x) = y(3y-1) - x(3x-1) = (y-x)*(3y+3x-1)
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x-y - 3x^2 + 3y^2 = (3y^2-y) - (3x^2-x) = y(3y-1) - x(3x-1) = (y-x)*(3y+3x-1)