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9+5x/2=2x-4 The answer is suppose to be -17 thank you for your help.

If the question is

(9+5x)/2 = 2x - 4 , then
9 + 5x = 4x - 8
x = -17

but ..

the way you typed it,
9 + 5x/2 = 2x - 4
18 + 5x = 4x - 8
x = -26

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