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-2x-9=4x-57
We move all terms to the left:
-2x-9-(4x-57)=0
We get rid of parentheses
-2x-4x+57-9=0
We add all the numbers together, and all the variables
-6x+48=0
We move all terms containing x to the left, all other terms to the right
-6x=-48
x=-48/-6
x=+8
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