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31-4=2x+6
We move all terms to the left:
31-4-(2x+6)=0
We add all the numbers together, and all the variables
-(2x+6)+27=0
We get rid of parentheses
-2x-6+27=0
We add all the numbers together, and all the variables
-2x+21=0
We move all terms containing x to the left, all other terms to the right
-2x=-21
x=-21/-2
x=10+1/2
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