\[3y - 2x = - 5:\]
\[1,2x - ( - 0,4x + 2,4y) =\]
\[= 1,2x + 0,4x - 2,4y = 1,6x - 2,4y =\]
\[= - 0,8y(3y - 2x)\]
\[- 0,8 \cdot ( - 5) = 4.\]
\[Ответ:4.\]