9x+81=21x

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Solution for 9x+81=21x equation: 



9x+81=21x

We move all terms to the left:

9x+81-(21x)=0

We add all the numbers together, and all the variables

-12x+81=0

We move all terms containing x to the left, all other terms to the right

-12x=-81

x=-81/-12

x=6+3/4

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