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18=-2x+9
We move all terms to the left:
18-(-2x+9)=0
We get rid of parentheses
2x-9+18=0
We add all the numbers together, and all the variables
2x+9=0
We move all terms containing x to the left, all other terms to the right
2x=-9
x=-9/2
x=-4+1/2
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