Answer:
8
Step-by-step explanation:
If you replace x with the given answers, the only one that would make both answers the same is 8
7x - 4 = 5x + 12
7x - 5x - 4 = 5x - 5x + 12
2x - 4 = 12
2x - 4 + 4 = 12 + 4
2x = 16
2x/2 = 16/2
x = 8
