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-10=x/20-9
We move all terms to the left:
-10-(x/20-9)=0
We get rid of parentheses
-x/20+9-10=0
We multiply all the terms by the denominator
-x+9*20-10*20=0
We add all the numbers together, and all the variables
-1x-20=0
We move all terms containing x to the left, all other terms to the right
-x=20
x=20/-1
x=-20
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