There can be no solution to a number. That is like asking what is the solution to 3!
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x = 40
y - x - 3 is an expression, not an equation nor an inequality. It cannot, therefore, have a solution.
All real numbers.
There are an infinite number of equations with this solution, eg x = 6 - 10; x = 45678 - 45682; x squared = 16 etc etc
no.. x equals 11