adjusting track volume separately in stereo recordings

I have a stereo music mp3 in which one track plays back too loudly and overwhelmed the other. Is it possible to adjust the volume of the two tracks separately? Any help would be appreciated!

Probably the easiest way is with the “Channel Mixer” plug-in: Missing features - Audacity Support
It is a “Nyquist Plug-in” and the installation instructions are here:

Alternatively, you could use a combination of the track’s “Pan” and “Gain” sliders: Track Control Panel and Vertical Scale - Audacity Manual