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-10=-9+x/2
We move all terms to the left:
-10-(-9+x/2)=0
We add all the numbers together, and all the variables
-(x/2-9)-10=0
We get rid of parentheses
-x/2+9-10=0
We multiply all the terms by the denominator
-x+9*2-10*2=0
We add all the numbers together, and all the variables
-1x-2=0
We move all terms containing x to the left, all other terms to the right
-x=2
x=2/-1
x=-2
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