Because without an equality sign it can not be considered to be an equation and therefore has no solution.
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Is (7, 9) a solution to the equation y = x?
x - 9 is an expression, neither an equation not an inequality. An expression cannot have a solution.
Only a linear equation in one variable x , which is an equation of the form ax + b = 0, (where a is different than 0), has only one solution. The solution is: x = -b/a
Here is an example: x + 5 = 5If you subtract five from both sides, you get x = 0, which is an example of getting 0 as a solution for an equation.
Solutions: x = 9 and x = 1 Factored: (x-9(x-1) = 0 Equation: x2-10x+9 = 0