I tend to disagree. In this simple math problem there is a definite answer, and only 1 correct one. If one replaces the problem with a real world description using apples and pears, the answer cannot be 12 or 0.75 apples. Only one is true.

If we were talking quantum math, probability math,....then yes. But this is basic algebra.

In computer science, your computer does not actually solve the equation the way you normally would, but uses the concept called "reverse polish notation", but that is for another thread.