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a+3b=12
eliminasi yang itu dapatnya
b=5
a=-3(suku pertama)
dit: U1=...
U3= U1 + (3-1)b
7= U1 + (2)5
7= U1 +10
U1= -7 + 10
U1 = -3
jadi, suku pertama barisan tsd = -3