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43=57-2x
We move all terms to the left:
43-(57-2x)=0
We add all the numbers together, and all the variables
-(-2x+57)+43=0
We get rid of parentheses
2x-57+43=0
We add all the numbers together, and all the variables
2x-14=0
We move all terms containing x to the left, all other terms to the right
2x=14
x=14/2
x=7
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