x - 9 is an expression, neither an equation not an inequality. An expression cannot have a solution.
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x^2 +9 =x^2 -9 9=-9 No solution
(x-9)(X+8)
If you mean: 9(x-1) = -45 then 9x-9 = -45 and it works out that x = -4
(-6 x 8) + (6 x 9) = 6 is one solution. 6-8 / 6-9 is another solution.
If you mean: x+4x--9 = x+1 then 4x = -8 and x = -2