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U3 = a+(2)b
14= a + 2b
26 = a + 6b -
-12 = -4b
b = 3
14=a+2(3)
a =14-6
a = 8
u18=8+17*3
u18=59
s18=n/2(a+u18)
=18/2(8+59)
=9(67)
=603