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b = 1
U50 = 2x+50
S50 = 4275
Sn = n/2 (a+Un)
S50 = 50/2 (a+Un)
4.275 = 25 (2x+1+2x+50)
4275 = 25 (4x + 51)
4275/25 = 4x + 51
171 = 4x + 51
4x = 171-51
4x = 120
x = 120/4
x = 30