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-43x-43=-42x+42
We move all terms to the left:
-43x-43-(-42x+42)=0
We get rid of parentheses
-43x+42x-42-43=0
We add all the numbers together, and all the variables
-1x-85=0
We move all terms containing x to the left, all other terms to the right
-x=85
x=85/-1
x=-85
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