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84=2x+18+2x
We move all terms to the left:
84-(2x+18+2x)=0
We add all the numbers together, and all the variables
-(4x+18)+84=0
We get rid of parentheses
-4x-18+84=0
We add all the numbers together, and all the variables
-4x+66=0
We move all terms containing x to the left, all other terms to the right
-4x=-66
x=-66/-4
x=16+1/2
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