Simplify
7
x
m
(
4
−
7
x
2
m
+
3
x
)
+
(
−
7
x
+
4
x
2
m
+
7
)
\displaystyle {7}{x}{m}{\left({4}-{7}{x}^{{2}}{m}+{3}{x}\right)}+{\left(-{7}{x}+{4}{x}^{{2}}{m}+{7}\right)}
7
x
m
(
4
−
7
x
2
m
+
3
x
)
+
(
−
7
x
+
4
x
2
m
+
7
)
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