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3(2x+7)=x+81

We move all terms to the left:

3(2x+7)-(x+81)=0

We multiply parentheses

6x-(x+81)+21=0

We get rid of parentheses

6x-x-81+21=0

We add all the numbers together, and all the variables

5x-60=0

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

5x=60

x=60/5

x=12

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