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X-7=21.X=
We move all terms to the left:
X-7-(21.X)=0
We add all the numbers together, and all the variables
X-(+21.X)-7=0
We get rid of parentheses
X-21.X-7=0
We add all the numbers together, and all the variables
-20X-7=0
We move all terms containing X to the left, all other terms to the right
-20X=7
X=7/-20
X=-7/20
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