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4x - 8y - 4 = 4 * (x - 2y - 1)
7xy - 14x²y = 7xy * (1 - 2x)
18a²b² + 9ab² = 9ab² * (2a + 1)
b) 4x-8y-4 = 4(x-2y-1)
c) 7xy-14x^2y = (7xy(1-2x)
d) 18a^2b^2+9ab^2 = 9ab^2(2a+1)