Answer
x/3 = 3
Explanation
Substituting x = 1 into the second equation:

Given that the same result is obtained at both sides of the equation, then x = 1 is a solution to the equation.
Substituting x = 1 into the third equation:

Given that the same result is obtained at both sides of the equation, then x = 1 is a solution to the equation.
Substituting x = 1 into the fourth equation:

Given that the same result is obtained at both sides of the equation, then x = 1 is a solution to the equation.
Substituting x = 1 into the first equation:

Given that different results are obtained at both sides of the equation, then x = 1 is not a solution to the equation.