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84-(9x-36)=3x
We move all terms to the left:
84-(9x-36)-(3x)=0
We add all the numbers together, and all the variables
-3x-(9x-36)+84=0
We get rid of parentheses
-3x-9x+36+84=0
We add all the numbers together, and all the variables
-12x+120=0
We move all terms containing x to the left, all other terms to the right
-12x=-120
x=-120/-12
x=+10
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