Solve –x + 4 = 3x + 4. check your solution.
a. x = 2
b. x = 4
c. x = 12
d. x = 0

-x + 4 = 3x + 4
move the x over
4 = 4x + 4
subtract 4
0 = 4x
x = 0

Check:
-0 + 4 = 3(0) +4
4 = 4

The answer would be option 4

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.