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4x-9=-x+9
We move all terms to the left:
4x-9-(-x+9)=0
We add all the numbers together, and all the variables
4x-(-1x+9)-9=0
We get rid of parentheses
4x+1x-9-9=0
We add all the numbers together, and all the variables
5x-18=0
We move all terms containing x to the left, all other terms to the right
5x=18
x=18/5
x=3+3/5
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