If you use your TI-83, you could simply punch in the function:
The x you are searching for is the x-value at the intersection between the graphs of and .
Can you input 'Ans' in your calculator (portable)? That means it can memorize the value obtained before and use the value in other calculation.
Set it to be about
and press ' Enter' followed by ' Enter' ,' Enter',' Enter',' Enter',.... until no observable change on the screen , then the value displayed on it is the solution . It is
The key to find out the solution is to put one of the variable as the subject . Here we can put or
I also obtain the other solution ,