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20-x/7=9
We move all terms to the left:
20-x/7-(9)=0
We add all the numbers together, and all the variables
-x/7+11=0
We multiply all the terms by the denominator
-x+11*7=0
We add all the numbers together, and all the variables
-1x+77=0
We move all terms containing x to the left, all other terms to the right
-x=-77
x=-77/-1
x=+77
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