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x-(2x-9)=99
We move all terms to the left:
x-(2x-9)-(99)=0
We get rid of parentheses
x-2x+9-99=0
We add all the numbers together, and all the variables
-1x-90=0
We move all terms containing x to the left, all other terms to the right
-x=90
x=90/-1
x=-90
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