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(a - b)^7 = a^7 - 7a^6 b + 21a^5 b^2 - 35a^4 b^3 - 21a^2 b^5 + 7ab^6 - b^7
dengan mensubstitusi a = x dan b = 2y maka:
(x - 2y)^7 = x^7 - 14x^6 y + 84x^5 y^2 - 280x^4 y^3 + 560 x^3 y^4 - 672 x^2 y^5 + 448 xy^6 - 128y^7