The expression
3
(
7
x
2
+
3
x
+
7
)
−
5
(
4
x
2
+
2
x
+
7
)
\displaystyle {3}{\left({7}{x}^{{2}}+{3}{x}+{7}\right)}-{5}{\left({4}{x}^{{2}}+{2}{x}+{7}\right)}
3
(
7
x
2
+
3
x
+
7
)
−
5
(
4
x
2
+
2
x
+
7
)
equals
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Question 6
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\displaystyle
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