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28 log 147 =
2 log 147 / 2 log 28 =
2 log ( 3 x 7 x 7 ) / 2 log ( 2 x 2 x 7 ) =
(2 log 3 + 2 log 7 + 2 log 7) / ( 2 log 2 + 2 log 2 + 2 log 7 )=
(1/a + b + b) / ( 1+1+b)=
(1/a + 2b) / (2 + b)
# 3 log 2 = a jdinya 2 log 3 = 1/a