I found the answer. hehehehehehehehrheehrhrh
Answer:
r = 20
Step-by-step explanation:
-4 = r/20 - 5
-4 + 5 = r/20 - 5 + 5
1 = r/20
1 * 20 = r/20 * 20
r = 20
(the answer is) = 6466602
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The two other prime factors are
3 and 11