Simplify the rational expression
x
4
+
3
x
3
x
3
+
7
x
2
+
12
x
\displaystyle \frac{{{x}^{{4}}+{3}{x}^{{3}}}}{{{x}^{{3}}+{7}{x}^{{2}}+{12}{x}}}
x
3
+
7
x
2
+
12
x
x
4
+
3
x
3
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