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20=x/9-1
We move all terms to the left:
20-(x/9-1)=0
We get rid of parentheses
-x/9+1+20=0
We multiply all the terms by the denominator
-x+1*9+20*9=0
We add all the numbers together, and all the variables
-1x+189=0
We move all terms containing x to the left, all other terms to the right
-x=-189
x=-189/-1
x=+189
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