10(5-10^3x-5)=9
x=





log 41 log 10 = 3x 5
log 41 1 = 3x 5
log 41 = 3x 5 + 1
log 41 = 3x 4
------- Applying change of base
1.612784 = 3x 4
1.612784 + 4 = 3x
5.612784 = 3x
, or 
You can do the check!!
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