(7*4)-(7*81)=x

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Solution for (7*4)-(7*81)=x equation: 



(7*4)-(7*81)=x

We move all terms to the left:

(7*4)-(7*81)-(x)=0

We add all the numbers together, and all the variables

-x+28-567=0

We add all the numbers together, and all the variables

-1x-539=0

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

-x=539

x=539/-1

x=-539

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