\[\boxed{\text{5.\ 25}}\]
\[1)\ (13,4 - y) \cdot 4,3 - 20,5 =\]
\[= 78,05 + 6,7y\]
\[57,62 - 4,3y - 20,5 - 6,7y =\]
\[= 78,05\]
\[- 11y = 78,05 - 27,12\]
\[- 11y = 50,93\]
\[y = - 4,63.\]
\[2)\ (16,2 - x) \cdot 3,2 - 50,08 =\]
\[= - 8,12 - 5,1x\]
\[51,84 - 3,2x - 50,08 + 5,1x =\]
\[= - 8,12\]
\[1,9x = - 8,12 - 1,76\]
\[1,9x = - 9,88\]
\[x = - 9,88\ :1,9\]
\[x = - 5,2.\]