There is no solution set. x + 57 is an expression, not an equality, nor even an inequality. An expression CANNOT be solved!
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A solution set makes a mathematical sentence TRUE.
the 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!
2x + 4 is an expression, not an equation. There can be no solution set for an expression.
27s is the answer