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In a geometric progression, the second term exceeds the first term by 20 and the fourth term exceeds the second term by 15. Find the possible values of the first term.

ar - a = 20

ar

^{3}- ar = 15

ar = 20 + a

(20 + a)

^{3}- (20 + a) = 15

But this method seem to be wrong. Any help?