5x + 3 = 12
take the 3 to the other side
5x = 12 - 3 = 9
5x = 9
divide both sides by 5
x = 9/5
x = 1.8
The common domain for the variables is; It is true on every set with no more than 22 members and false on other sets.
<h3>What is the domain of the variables?</h3>
We are given the statement;
∀x∀y((x ≠ y) → ∀z((z = x) ∨ (z = y)))
Since x and y are different objects in the domain, then we can say that anything in the domain is equal to x or to y.
Now, If the domain M has two elements, it means that the given sentence will obviously hold. Also, a one-element domain will work since there wouldn't be a pair x, y such that x ≠ y.
We can conclude that the common domain for the variables is; It is true on every set with no more than 22 members and false on other sets.
An example is that it is true on {a,b} and false on R
Read more about domain of variables at; brainly.com/question/11860069
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