Multiply and simplify completely:
x
+
4
2
x
+
8
⋅
3
x
+
21
x
+
7
\displaystyle \frac{{{x}+{4}}}{{{2}{x}+{8}}}\cdot\frac{{{3}{x}+{21}}}{{{x}+{7}}}
2
x
+
8
x
+
4
⋅
x
+
7
3
x
+
21
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