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9x=7x+84

We move all terms to the left:

9x-(7x+84)=0

We get rid of parentheses

9x-7x-84=0

We add all the numbers together, and all the variables

2x-84=0

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

2x=84

x=84/2

x=42

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