me assume that stuf spozed tu be "0.5x^-0.6=4" so, x^-0.6=8... log(x^-0.6)=log(8)=0.903089987... -0.6*log(x)=0.903089987..... log(x)=0.903089987/(-0.6) log(x)=-1.505149978... invers av log=power, so x=10^-1.505149978 or x=1/10^+1.505149978 =1/32 =0.03125