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Un = a + (n-1)b
2x+50 = 2x+1 + (n-1)1
49 = n-1
50 = n
n = 50
Sn = n (a+Un)
= 50 (2x+1 + 2x+50)
4275 = 25 (4x+51)
171 = 4x+51
120 = 4x
30 = x
x = 30