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50-71=-x+139
We move all terms to the left:
50-71-(-x+139)=0
We add all the numbers together, and all the variables
-(-1x+139)+50-71=0
We add all the numbers together, and all the variables
-(-1x+139)-21=0
We get rid of parentheses
1x-139-21=0
We add all the numbers together, and all the variables
x-160=0
We move all terms containing x to the left, all other terms to the right
x=160
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