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-x-9=10x+2
We move all terms to the left:
-x-9-(10x+2)=0
We add all the numbers together, and all the variables
-1x-(10x+2)-9=0
We get rid of parentheses
-1x-10x-2-9=0
We add all the numbers together, and all the variables
-11x-11=0
We move all terms containing x to the left, all other terms to the right
-11x=11
x=11/-11
x=-1
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