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6=20+2x
We move all terms to the left:
6-(20+2x)=0
We add all the numbers together, and all the variables
-(2x+20)+6=0
We get rid of parentheses
-2x-20+6=0
We add all the numbers together, and all the variables
-2x-14=0
We move all terms containing x to the left, all other terms to the right
-2x=14
x=14/-2
x=-7
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