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U7 = a + (7-1)b
38 = a + 6b
suku ke Un = a + (n-1)b
a= nilai awal
b=selisih
u7 = a + (7-1)b = 38
U3= a + (3-1)b=18
itu di eliminasi untuk mencari nilai b
lalu disubtitusi untuk mencari nilai a