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- u3=7*c - 8
- u4=9*(7*c-8) - 15*c = 48*c - 72
- u3 divides u4 <==> 7*c - 8 / 3*2*2*2*(2*c -3)
- 7*c - 8 = 0 mod 3
- 7*c - 8 = 0 mod 8
- ==> 7*c = 2 mod 3 ==> c = 2 mod 3
- ==> 7*c = 0 mod 8 ==> c = 0 mod 8
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