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check the solution.
A solution set makes a mathematical sentence TRUE.
It is the answer to a mathematical problem.
x - 9 is an expression, neither an equation not an inequality. An expression cannot have a solution.
-15 + x100 is an expression, not an equation nor inequality. There is, therefore, no solution.-15 + x100 is an expression, not an equation nor inequality. There is, therefore, no solution.-15 + x100 is an expression, not an equation nor inequality. There is, therefore, no solution.-15 + x100 is an expression, not an equation nor inequality. There is, therefore, no solution.