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x=9x+18
We move all terms to the left:
x-(9x+18)=0
We get rid of parentheses
x-9x-18=0
We add all the numbers together, and all the variables
-8x-18=0
We move all terms containing x to the left, all other terms to the right
-8x=18
x=18/-8
x=-2+1/4
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