[tex]\begin{align}
5n + 9n + 32 &= 200 \
14n + 32 &= 200 \
14n &= 168 \
n &= 12
\end{align}[/tex]

[tex]\begin{align}
(x + 57) \div 7 &= 12 \
x + 57 &= 84 \
x &= 27
\end{align}[/tex]

[tex]\begin{align}
(161 - y) \div 16 &= 9 \
161 - y &= 144 \
-y &= -17 \
y &= 17
\end{align}[/tex]

[tex]\begin{align}
112 \div (17 + x) &= 4 \
112 &= 4(17 + x) \
112 &= 68 + 4x \
44 &= 4x \
x &= 11
\end{align}[/tex]