6=81-3x

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Solution for 6=81-3x equation: 



6=81-3x

We move all terms to the left:

6-(81-3x)=0

We add all the numbers together, and all the variables

-(-3x+81)+6=0

We get rid of parentheses

3x-81+6=0

We add all the numbers together, and all the variables

3x-75=0

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

3x=75

x=75/3

x=25

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