Yes as for example x = 5 which is a straight vertical line parallel to the y axis
-26
The linear equation x=5 or any other number is a vertical line. There are more than one possible answer for y. Therefore it is not a function.
Some do and some don't. It's possible but not necessary.
7
Without an equality sign the given expression is not an equation and so therefore a solution is not possible.
It is normally regarded as an equation, where y is a function of x. It is possible to regard it as a boolean expression (the equality is true or false).
The question contains an expression but not an equation nor inequality. It is, therefore, not possible to "solve" anything for x.
Let's assume (for simplicity) that "y" is a function of "x". That means that for every value of "x", there is a unique value of "y". In this case, if the equation can be solved for "y", it is a function. Some equations are difficult or impossible to solve explicitly for "y"; in this case, "y" may still be a function of "x", if for every value of "x" only a single value of "y" is possible for the equation. However, if this is the case, it may be difficult to verify.
It is not possible to answer the question. An equation or inequality can be solved. However, the question contains no equation nor inequality but only an expression.
There is no possible value of x that will satisfy the given equation. There is no possible value of x that will satisfy the given equation. There is no possible value of x that will satisfy the given equation. There is no possible value of x that will satisfy the given equation.
It might have been possible to answer the question if you had bothered to include any equations below. But since you haven't there can be no answer.
Yes, zero could be a possible solution to the equation.