Answer
$(f-g)(x)=-x+3$
Work Step by Step
Since $(f-g)(x) = f(x)-g(x)$, then,
\begin{array}{l}
(f-g)(x)=x-(2x-3)\\\\
(f-g)(x)=x-2x+3\\\\
(f-g)(x)=-x+3
.\end{array}
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