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-2x-9+7x=6x+8x
We move all terms to the left:
-2x-9+7x-(6x+8x)=0
We add all the numbers together, and all the variables
-2x+7x-(+14x)-9=0
We add all the numbers together, and all the variables
5x-(+14x)-9=0
We get rid of parentheses
5x-14x-9=0
We add all the numbers together, and all the variables
-9x-9=0
We move all terms containing x to the left, all other terms to the right
-9x=9
x=9/-9
x=-1
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