Without an equality sign the given terms can't be considered to be an equation.
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The expression of y8x-9 has no solution because without an equality sign it can not be considered to be an equation.
X+9=17;8
If you mean: 3x-9 = 12 then the value of x is 7
the solution is the answer to the equation. A solution is any value that makes the equation true. x + 2 = 10 has exactly one solution ....x=8 x + 2 > 10 has infinitely many solutions....x=9 or 10 or 11 or 12 or 13, etc
If you mean x+4 = 13 then the value of x is 9