if x is an unkown number, there is no answer. It's an expression. If you mean -3 times -9, the answer is -27.
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3x-6y=9 -3x -3x -6y=9-3x __ ____ -6 -6 y=9-3x ____ -6
3x-9 to = -6
3x+9/2=9 3x=9-9/2 3x=9/2 x=9/6 x=3/2
7x - 9 = 3x + 5 7x - 3x - 9 = 5 7x - 3x = 5 + 9 4x = 14 x = 14/4
3x - 2 = 9 3x = 9 + 2 = 11 x = 11/3