log7(3x)
解得 x>0且x<1
所以 不等式的解是0
loga(2a-1)>0
即 loga(2a-1)>loga(1)
当a>1时,即2a-1>1,解得a>1
当0
所以 原不等式解集是a>1或1/2
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