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-9x-9=9x-99
We move all terms to the left:
-9x-9-(9x-99)=0
We get rid of parentheses
-9x-9x+99-9=0
We add all the numbers together, and all the variables
-18x+90=0
We move all terms containing x to the left, all other terms to the right
-18x=-90
x=-90/-18
x=+5
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