Question

If 9 were subtracted from three times a number, the result would be the same as if 4 were added to twice the number. what is the number?

Answer 1

3x-9=2x+4
3x-9+9=2x+4+9
3x=2x+13
3x-2x=2x-2x+13
x=13
Check:
3(13)-9=2(13)+4
39-9=26+4
30=30