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81+63x=9-83x
We move all terms to the left:
81+63x-(9-83x)=0
We add all the numbers together, and all the variables
63x-(-83x+9)+81=0
We get rid of parentheses
63x+83x-9+81=0
We add all the numbers together, and all the variables
146x+72=0
We move all terms containing x to the left, all other terms to the right
146x=-72
x=-72/146
x=-36/73
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