an = a1 + d(n - 1)
a30 = a1 + 29d
128 = a1 + 29*4
128 = a1 + 116
a1 = 12
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Verified answer
an = a1 + d(n - 1)
a30 = a1 + 29d
128 = a1 + 29*4
128 = a1 + 116
a1 = 12