3x²+9xy+27x³a - 3x(x+3y+9x²a), 10ab³+15a²b +25ab² - 5ab(2b²+3a+5b), -8ax²+16ay-24a² - 8a(-x²+2y-3a), 25xz²+30x²z - 5xz(5z+6x), 7a²y+11a³c+13a²b - a²(7y+11ac+13b), 12xc²+6ac+18cd² - 6c(2xc+a+3d²),

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