Let the number of miles be x.
Then, x miles cost 0.6x.
The initial fixed fee is $5, and the toll is $5.
cost = initial fixed fee + cost per mile + toll
46 = 5 + 0.6x + 5
0.6x + 10 = 46
0.6x = 36
x = 36/0.6
x = 60
You can travel 60 miles.
Evaluate this...

the x at the bottom cancels out one of the xs at the top so it will be

Now the one cancels out one of the 1s in the -4 so

Hope this helps :)