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U3 =U1+2b =-11 -
7b = -49
b = -7
U3 = U1+2(-7)
-11 = U1-14
-U1 = -14+11
U1 = 3
Un = U1+(n-1)b
U21=3+(21-1)-7
=3+(20x-7)
U21 = 3-140
U21 = -137