The answer will depend on what exactly x represents. With no information about that, the question is pointless.
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It depends on the problem you are trying to solve. like; 2x + 3 = 13. it would be "5". (Multiplication.) or x/3 = 6. x= 18. this is a division problem. Like I said, it all depends on your problem.
x
x=8
When x = 5, 12x = 12*5 = 60.
x=8