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-20-30=x/9
We move all terms to the left:
-20-30-(x/9)=0
We add all the numbers together, and all the variables
-(+x/9)-20-30=0
We add all the numbers together, and all the variables
-(+x/9)-50=0
We get rid of parentheses
-x/9-50=0
We multiply all the terms by the denominator
-x-50*9=0
We add all the numbers together, and all the variables
-1x-450=0
We move all terms containing x to the left, all other terms to the right
-x=450
x=450/-1
x=-450
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