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21-6x=98x-
We move all terms to the left:
21-6x-(98x-)=0
We add all the numbers together, and all the variables
-6x-(+98x)+21=0
We get rid of parentheses
-6x-98x+21=0
We add all the numbers together, and all the variables
-104x+21=0
We move all terms containing x to the left, all other terms to the right
-104x=-21
x=-21/-104
x=21/104
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