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5 93/512 = 8 *[ (1-(-3/4) ^n ] / ( 1+3/4) /:8
2653/512 *1/8=[(1-(-3/4) ^n] / (7/4)
2653/4096= [ 1-(3/4) ^n ] *4/7 / *7
18571/4096=4 [ 1-(-3/4) ^n] /;4
18571/16384= 1-(-3/4) ^n
(-3/4)^n=16384/16384-18571/16384
(-3/4) ^n=- 2187/16384
(-3/4) ^n=(-3/4) ^7
n=7