expand 6\sum _{r=0}^{4}\binom{4}{r}\times \binom{2r+3}{3} \times x^{2r} \times ( -5)^{4-r}expand 6\sum _{r=0}^{4}\binom{4}{r}\times \binom{2r+3}{3} \times x^{2r} \times ( -5)^{4-r}

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