remember that a*log(b) = 
log(x)
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document.write( "log(x) = 2/3 * log(y) = log(y^(2/3)).
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document.write( "Remember if log(a) = log(b) then a=b
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document.write( "x = y^(2/3)
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document.write( "Similarly x = z^(2/5)
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document.write( "y^(2/3) * y^(1/3) = y. y^(1/3) = sqrt(x) so y = x*sqrt(x)
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document.write( "z^(2/5) * z^(2/5) * z^(1/5) = z. z^(2/5) = x, so that's x*x*sqrt(x) = x^2 * sqrt(x).
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document.write( "yz = 
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