f(x) = 3x + 9
y = 3x + 9
so 3x = y - 9
x = y/3 - 3
Therefore, the inverse function is g(x) = x/3 - 3
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the answer is -3x = 0
3x-2y+9+9y-x = 2x+7y+9
-3x + 2y = 9 2y = 3x + 9y = 1,5x + 4,5
9
The expression can be simplified to: 12x-9