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X+-13=40.X
We move all terms to the left:
X+-13-(40.X)=0
We add all the numbers together, and all the variables
X-(+40.X)-13+=0
We add all the numbers together, and all the variables
X-(+40.X)=0
We get rid of parentheses
X-40.X=0
We add all the numbers together, and all the variables
-39X=0
X=0/-39
X=0
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