Find all the roots of the polynomial:

y=x5+7x415x3+5x2+16x12\displaystyle {y}=-{x}^{{5}}+{7}{x}^{{4}}-{15}{x}^{{3}}+{5}{x}^{{2}}+{16}{x}-{12}

List all roots, separated by comma:

x=\displaystyle {x}=