Question 945671
{{{log(2^x)log(4^x)log(8^x)=21/4}}}

{{{x*log(2)*x*log(4)*x*log(8)=21/4}}}

{{{x^3*log(2)*log(2^2)*log(2^3)=21/4}}}

{{{x^3*log(2)*2log(2)*3log(2)=21/4}}}  

{{{x^3*6(log(2))^3=21/4}}}

{{{x^3=(21/4)/6(log(2))^3}}}

{{{x^3=21/(24(log(2))^3)}}}

{{{x^3=cross(21)7/(cross(24)8(log(2))^3)}}}

{{{x^3=7/(8(log(2))^3)}}}

{{{x^3=7/(2^3(log(2))^3)}}}


{{{x=root(3,(7/(2^3(log(2))^3)))}}}


{{{x=root(3,7)/(root(3,2^3)root(3,(log(2))^3))}}}


{{{x=root(3,7)/(2log(2))}}}-> exact solution


{{{x=1.91293/1.38629436}}}

{{{x=1.379887}}}-> approximate solution