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-9x-8=+12+x
We move all terms to the left:
-9x-8-(+12+x)=0
We add all the numbers together, and all the variables
-9x-(x+12)-8=0
We get rid of parentheses
-9x-x-12-8=0
We add all the numbers together, and all the variables
-10x-20=0
We move all terms containing x to the left, all other terms to the right
-10x=20
x=20/-10
x=-2
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