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-71=-31+2x
We move all terms to the left:
-71-(-31+2x)=0
We add all the numbers together, and all the variables
-(2x-31)-71=0
We get rid of parentheses
-2x+31-71=0
We add all the numbers together, and all the variables
-2x-40=0
We move all terms containing x to the left, all other terms to the right
-2x=40
x=40/-2
x=-20
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