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Verified answer
U3+U9+U11 = 75a+2b+a+8b+a+10b = 75
3a+20b = 75
U22 = a+21b =68 => a = -21b + 68
3a+20b = 75
3(-21b+68)+20b = 75
-63b+204+20b = 75
-43b = 75 - 204
-43b = -129
b = 3
a = -21b + 68
a = -21(3)+68
a = -63 + 68
a = 5
U43 = a+42b
U43 = 5+42(3)
U43 = 5+126
U43 = 131
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