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4x=9x-85
We move all terms to the left:
4x-(9x-85)=0
We get rid of parentheses
4x-9x+85=0
We add all the numbers together, and all the variables
-5x+85=0
We move all terms containing x to the left, all other terms to the right
-5x=-85
x=-85/-5
x=+17
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