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57=4x+2x-9
We move all terms to the left:
57-(4x+2x-9)=0
We add all the numbers together, and all the variables
-(6x-9)+57=0
We get rid of parentheses
-6x+9+57=0
We add all the numbers together, and all the variables
-6x+66=0
We move all terms containing x to the left, all other terms to the right
-6x=-66
x=-66/-6
x=+11
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