Question 970517
 My question is: 4x-9=3.5x-9
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That's not a question.  It's and equation.
If you want to solve it for x, you should say, "Solve for x."
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4x-9 = 3.5x-9
Add 9 to each side.
4x = 3.5x
Subtract 3.5x from each side.
0.5x = 0
x = 0