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12x-3x+84=12x+45

We move all terms to the left:

12x-3x+84-(12x+45)=0

We add all the numbers together, and all the variables

9x-(12x+45)+84=0

We get rid of parentheses

9x-12x-45+84=0

We add all the numbers together, and all the variables

-3x+39=0

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

-3x=-39

x=-39/-3

x=+13

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