81-5x=4x

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Solution for 81-5x=4x equation: 



81-5x=4x

We move all terms to the left:

81-5x-(4x)=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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