Answer:
IV
Explanation:
I has no solution since you can't subtract 3 from a number and get the same number as the difference.
II has infinite amount of solutions.
III has no solutions since a 4 more than a number doesn't equal 4 less than a number.
IV: 4x-5=6x+3
4x=6x+8
-2x=8
x=-4 ==> 1 solution