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(X+20)-90=X
We move all terms to the left:
(X+20)-90-(X)=0
We add all the numbers together, and all the variables
-1X+(X+20)-90=0
We get rid of parentheses
-1X+X+20-90=0
We add all the numbers together, and all the variables
-70!=0
There is no solution for this equation
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