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If the coefficients of x3x^3x3 and x4x^4x4 in the expansion of (1+ax+bx2)(1−2x)18(1+ax+bx^2)(1-2x)^{18}(1+ax+bx2)(1−2x)18 in the powers of xxx are both zero, what is (a,b)(a,b)(a,b)?
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