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31=6x+6x+7
We move all terms to the left:
31-(6x+6x+7)=0
We add all the numbers together, and all the variables
-(12x+7)+31=0
We get rid of parentheses
-12x-7+31=0
We add all the numbers together, and all the variables
-12x+24=0
We move all terms containing x to the left, all other terms to the right
-12x=-24
x=-24/-12
x=+2
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