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mn - 4m - 5n + 20
= (mn - 5n) - (4m - 20)
= n(m - 5) - 4(m - 5)
= (m -5)(n - 4)
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5(n - 2)
n = 70/5 n = 14
The GCF is 5n
40n^2 + 64n = n(40n + 64) = 8n(5n + 8)
3/5, 9/15, 12/20, 3n/5n for all n = 5, 6, 7, ...