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a - ar³ = 404 ......pers. 1
U4 - U7 = 52
ar³ - ar⁶ = 52 ..... faktorkan
r³ (a - ar³) = 52 ..... ganti (a - ar³) = 404
r³ (404) = 52
r³ = 52/404
a - ar³ = 404
a (1 - r³) = 404
a (1 - 52/404) = 404
a (352/404) = 404
a = 404 : 352/404
a = 404 x 404/352
a = 163216/352
maaf kalau salah :)