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7(x-6)=6x-69

We move all terms to the left:

7(x-6)-(6x-69)=0

We multiply parentheses

7x-(6x-69)-42=0

We get rid of parentheses

7x-6x+69-42=0

We add all the numbers together, and all the variables

x+27=0

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

x=-27

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