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208=138-x
We move all terms to the left:
208-(138-x)=0
We add all the numbers together, and all the variables
-(-1x+138)+208=0
We get rid of parentheses
1x-138+208=0
We add all the numbers together, and all the variables
x+70=0
We move all terms containing x to the left, all other terms to the right
x=-70
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