Найдите корень уравнения: (8x+3)-(10x+6)=9.

\[(8x + 3) - (10x + 6) = 9\]

\[8x + 3 - 10x - 6 = 9\]

\[- 2x = 9 - 3 + 6\]

\[- 2x = 12\]

\[x = - 6.\]