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u3 = 12 a+2b = 12
--------------------------- -
-1b = -10
b = -10/ -1
b = 10
a+2b = 12
a+2.10 = 12
a+20 = 12
a = 12 - 20
a = -8
un = a+(n-1)b
u8 = -8+(8-1)10
= -8+70
u8 = 62