Subtract the polynomials and simplify the result completely:

(5x510x34x7)(8x510x4+12x31)\displaystyle {\left(-{5}{x}^{{5}}-{10}{x}^{{3}}-{4}{x}-{7}\right)}-{\left(-{8}{x}^{{5}}-{10}{x}^{{4}}+{12}{x}^{{3}}-{1}\right)}