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18=2x+20
We move all terms to the left:
18-(2x+20)=0
We get rid of parentheses
-2x-20+18=0
We add all the numbers together, and all the variables
-2x-2=0
We move all terms containing x to the left, all other terms to the right
-2x=2
x=2/-2
x=-1
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