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20=3x+6x+2
We move all terms to the left:
20-(3x+6x+2)=0
We add all the numbers together, and all the variables
-(9x+2)+20=0
We get rid of parentheses
-9x-2+20=0
We add all the numbers together, and all the variables
-9x+18=0
We move all terms containing x to the left, all other terms to the right
-9x=-18
x=-18/-9
x=+2
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