Solve for x.
4. 31-1 = 92x+4

Answer is x=13/46.

Simply the equation first, 31-1=92x+4 becomes 30=92x+4.
Flip the equation, 30=92x+4 becomes 92x+4=30.
Subtract 4 from both sides, 92x+4-4=30-4, it then becomes 92x=26.
After that, divide both side since x should be left alone, 92x/92=x , 26/92 - divide it by 2 for a smaller number, and finally it becomes 13/46. And finally x=13/46

38 dollars is your answer.