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u8 = 31
b = (52-31)/(15-8) = 21/7 = 3
u8 = a + 7b
31 = a + 7x3
a = 31 - 21 = 10
u46 = a + 45b
= 10 + 45x3 = 145
S46 = 46/2 x (10+145) = 23 x 155 = 3.565