Factor
b
9
d
7
+
z
11
d
7
−
b
9
a
15
−
z
11
a
15
\displaystyle {b}^{{9}}{d}^{{7}}+{z}^{{11}}{d}^{{7}}-{b}^{{9}}{a}^{{15}}-{z}^{{11}}{a}^{{15}}
b
9
d
7
+
z
11
d
7
−
b
9
a
15
−
z
11
a
15
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