There can be no solution set because there is no equation or inequality, only an expression.
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Yes, empty set means null which is no solution.
An empty set is a set with no elements. It can be symbolized by {} or ø. The solution set for an equation that has no solution is also called an empty set.
A set would not normally have a solution. An equation or an inequality might.
Unsolvable equations have no solutions so the solution set would be [ ]. (empty set)
9x + 2x + 26 is an expression, not an equation (or inequality). It therefore cannot have a solution so that its solution set is the null set. There is nothing in the solution set - no integers, rationals, irrationals: nothing!