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20=x/2+11
We move all terms to the left:
20-(x/2+11)=0
We get rid of parentheses
-x/2-11+20=0
We multiply all the terms by the denominator
-x-11*2+20*2=0
We add all the numbers together, and all the variables
-1x+18=0
We move all terms containing x to the left, all other terms to the right
-x=-18
x=-18/-1
x=+18
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