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-18-(-20)=x/9
We move all terms to the left:
-18-(-20)-(x/9)=0
We add all the numbers together, and all the variables
-(+x/9)-18-(-20)=0
We add all the numbers together, and all the variables
-(+x/9)+2=0
We get rid of parentheses
-x/9+2=0
We multiply all the terms by the denominator
-x+2*9=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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