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U3 = 23
~~~~~~~~ -
7b = -21
b = -21/7
b = -3
U3 = a + 2b
23 = a + 2(-3)
a = 23+6
a = 29
Un = a - b + bn
Un = 29 -(-3) -3n
Un = 32 - 3n
U15 = 32 - 3(15)
U15 = 32 - 45
U15 = -13