2x + 4 is an expression, not an equation. There can be no solution set for an expression.
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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!
(2x - 10) + 7 = 52x - 3 = 52x = 8x = 4
Not sure what you mean; that equation certainly has a solution.
2x + 3 = 72x = 4x = 2
An equation, solution x = -10