a.Ta có : 92.22=(x+356):x+342
\(\Rightarrow92.4=\left(x+356\right):x+342\)
\(\Rightarrow368=\left(x+356\right):x+342\)
\(\Rightarrow\left(x+356\right):x=26\)
\(\Rightarrow x+356=26x\)
\(\Rightarrow x+356-26x=0\)
\(\Rightarrow356-25x=0\)
\(\Rightarrow-25x=356\)
\(\Rightarrow x=-\dfrac{356}{25}\)
vậy \(x=-\dfrac{356}{25}\)