Simplify
z
2
−
10
z
z
2
−
12
z
+
35
⋅
z
−
5
9
z
−
90
\displaystyle \frac{{{z}^{{2}}-{10}{z}}}{{{z}^{{2}}-{12}{z}+{35}}}\cdot\frac{{{z}-{5}}}{{{9}{z}-{90}}}
z
2
−
12
z
+
35
z
2
−
10
z
⋅
9
z
−
90
z
−
5
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Question 6
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