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-18=7x+
We move all terms to the left:
-18-(7x+)=0
We add all the numbers together, and all the variables
-(+7x)-18=0
We get rid of parentheses
-7x-18=0
We move all terms containing x to the left, all other terms to the right
-7x=18
x=18/-7
x=-2+4/7
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