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u4 = u3 + b => 12 + b
u6 = u3 + 3b => 12 + 3b
_______ +
24 + 4b = 40
b = (40-24)/4
b = 4
u3 = a + 2b
12 = a + 2(4)
a = 12-8
a = 4
u10 = a + 9b
u10 = 4 + 9(4)
u10 = 40