University Entrance Exam | Exponential Question | Find the value of X

[@1234larry1]

9^x+9^x=54
2(9^x)=54
9^x=27
9^x=3^3
(3^2)^x=3^3
X(log3^2)=log(3^3)
2xlog3=3log3
2x=(3log3)/log3
2x=3
X=2/3