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a) log₅ x-log₅ 2= 2log₅3 zał. x>0
log₅ (x/2)= log₅3²
x/2=9 /*2
x=18
b).2log₃√x-3log₃1/x=8 x>0
log₃√x²-log₃(1/x)³=8
log₃[√x²:(1/x)³]=8
√x²:(1/x)³=3⁸
x:1/x³=3⁸
x⁴=3⁸ /⁴√
x=(3⁸)^1/4
x=3²
x=9