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Students in the math interest group used to be
Simplify and acquire

(3x+9)k-3a-6=6x+3x。

From the equation that has nothing to do with the value of k, it is concluded that

3x+9=0？ 3a？ 6=9x，

The solution is x =? 3a=2 1，

The reason is that the equation has nothing to do with the value of k, but is actually a binary linear equation system about a and X.

Therefore, a=2 1 and x =-3.

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