\[4y - 3x = 6:\]
\[1,7x - (0,2x + 2y) = 1,7x - 0,2x - 2y =\]
\[= 1,5x - 2y = - \frac{1}{2} \cdot (4y - 3x)\]
\[- \frac{1}{2} \cdot 6 = - 3.\]
\[Ответ:\ - 3.\]