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8x+1=-81x
We move all terms to the left:
8x+1-(-81x)=0
We get rid of parentheses
8x+81x+1=0
We add all the numbers together, and all the variables
89x+1=0
We move all terms containing x to the left, all other terms to the right
89x=-1
x=-1/89
x=-1/89
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