Решите уравнение: 7+x(x-1)=x^2-1.

\[7 + x(x - 1) = x^{2} - 1\]

\[7 + x^{2} - x = x^{2} - 1\]

\[- x = - 1 - 7\]

\[- x = - 8\]

\[x = 8.\]