Question

f(x)=x+7/2X-1
domain?

Answer 1

I suppose,
\[f(x)=\frac{x+7}{2x-1}\]In order to obtain the domain you must remember that you cannot divide by zero, so,
\[2x-1=0\Rightarrow x=1/2\]Then
\[D=\mathbb{R}-\{1/2\}\]