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u8 + u11 = 55
(a+7b) + (a+10b) = 55
2a+17b = 55
a+4b = 14 (x2)
2a+17b = 55 (x1)
2a+8b = 28
2a+17b = 55
---------------- -
-9b = -27
b = 3
a+4b = 15
a+4(3) = 15
a = 3
u20 = a+19b = 3+19(3) = 60
u8 + u11 = 55
(a+7b) + (a+10b) = 55
2a+17b = 55
a+4b = 14 (x2)
2a+17b = 55 (x1)
2a+8b = 28
2a+17b = 55
---------------- -
-9b = -27
b = 3
a+4b = 15
a+4(3) = 15
a = 3
u20 = a+19b = 3+19(3) = 60
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