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-2x-9=-5x+18
We move all terms to the left:
-2x-9-(-5x+18)=0
We get rid of parentheses
-2x+5x-18-9=0
We add all the numbers together, and all the variables
3x-27=0
We move all terms containing x to the left, all other terms to the right
3x=27
x=27/3
x=9
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