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(20-x)-x=2
We move all terms to the left:
(20-x)-x-(2)=0
We add all the numbers together, and all the variables
(-1x+20)-x-2=0
We add all the numbers together, and all the variables
-1x+(-1x+20)-2=0
We get rid of parentheses
-1x-1x+20-2=0
We add all the numbers together, and all the variables
-2x+18=0
We move all terms containing x to the left, all other terms to the right
-2x=-18
x=-18/-2
x=+9
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