Subtract the polynomials and simplify the result completely:

(3x57x3x6)(2x512x4+3x35)\displaystyle {\left({3}{x}^{{5}}-{7}{x}^{{3}}-{x}-{6}\right)}-{\left({2}{x}^{{5}}-{12}{x}^{{4}}+{3}{x}^{{3}}-{5}\right)}