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38=20-x
We move all terms to the left:
38-(20-x)=0
We add all the numbers together, and all the variables
-(-1x+20)+38=0
We get rid of parentheses
1x-20+38=0
We add all the numbers together, and all the variables
x+18=0
We move all terms containing x to the left, all other terms to the right
x=-18
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