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-7-(-20)=x/9
We move all terms to the left:
-7-(-20)-(x/9)=0
We add all the numbers together, and all the variables
-(+x/9)-7-(-20)=0
We add all the numbers together, and all the variables
-(+x/9)+13=0
We get rid of parentheses
-x/9+13=0
We multiply all the terms by the denominator
-x+13*9=0
We add all the numbers together, and all the variables
-1x+117=0
We move all terms containing x to the left, all other terms to the right
-x=-117
x=-117/-1
x=+117
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