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(-2+-7)=x
We move all terms to the left:
(-2+-7)-(x)=0
We add all the numbers together, and all the variables
-x+(-9)=0
We add all the numbers together, and all the variables
-1x-9=0
We move all terms containing x to the left, all other terms to the right
-x=9
x=9/-1
x=-9
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