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81+4.89x=13.89x
We move all terms to the left:
81+4.89x-(13.89x)=0
We add all the numbers together, and all the variables
4.89x-(+13.89x)+81=0
We get rid of parentheses
4.89x-13.89x+81=0
We add all the numbers together, and all the variables
-9x+81=0
We move all terms containing x to the left, all other terms to the right
-9x=-81
x=-81/-9
x=+9
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