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U5 = 5b + a - b
8 = 4b + a
Un = bn + a - b
U11 = 11b + a - b
26 = 10b + a
8 = 4b + a
26 = 10b + a
-------------------- -
-18 = -6b
b = -18/-6
b = 3
8 = 4b + a
8 = 4(3) + a
8 = 12 + a
a = 8 - 12
a = -4