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3a + 20b = 75
(43 + 1)/2 = 22
U22 = a + 21b = 68
a = 68 - 21b
3(68 - 21b) + 20b = 75
204 - 63b + 20 b = 75
-43b = 75 - 204
-43b = -129
b = 3
a = 68 - 21b
a = 68 - 21(3)
a = 68 - 63
a = 5