\[3,2 - x = - 5,1\]
\[- x = - 5,1 - 3,2\]
\[- x = - (5,1 + 3,2)\]
\[- x = - 8,3\ \ \ \ \ | \cdot ( - 1)\]
\[x = 8,3\]
\[Ответ:\ x = 8,3.\]