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12x-3x+84=12x+48
We move all terms to the left:
12x-3x+84-(12x+48)=0
We add all the numbers together, and all the variables
9x-(12x+48)+84=0
We get rid of parentheses
9x-12x-48+84=0
We add all the numbers together, and all the variables
-3x+36=0
We move all terms containing x to the left, all other terms to the right
-3x=-36
x=-36/-3
x=+12
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