\[\boxed{\mathbf{494}.}\]
\[1)\ 3,4x + 5,6x = 9x\]
\[x = 0,08:\]
\[9 \cdot 0,08 = 0,72.\]
\[2)\ 2,5y - 1,2y + 3,7y =\]
\[= 1,3y + 3,7y = 5y\]
\[y = 4,72:\]
\[5 \cdot 4,72 = 23,6.\]