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65=42+x
We move all terms to the left:
65-(42+x)=0
We add all the numbers together, and all the variables
-(x+42)+65=0
We get rid of parentheses
-x-42+65=0
We add all the numbers together, and all the variables
-1x+23=0
We move all terms containing x to the left, all other terms to the right
-x=-23
x=-23/-1
x=+23
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